Over time, things that don't fit initially into a theory either are incorporated or explained away.  The fact that neither has happened in the last half-century suggests that there was more to the Kennedy Assassination than will ever meet the public record.

A few facts we know about his administration:

1. Kennedy had threatened to dismantle the CIA.

2. Kennedy was also ready to pull out of Vietnam.

These two facts alone would have given some government insiders reason to knock him off.  The fact that the ballistics information still does not all hang together after years of research again points to undisclosed facts.  If the Zapruder film is actually accurate, and was not doctored prior to being released to the public, then clearly additional gunmen were involved; anyone who as fired a weapon at water jugs knows how the rules of physics dictate the motion of the object penetrated by the bullet.

My best guess is that he was hit inside at close range by Secret Service agent(s). That at least would explain what we see on the film.

I also believe that Lee Harvey Oswald acted alone, and there was no conspiracy in the Kennedy Assassination. There have been numerous suggestions of errors or downright misleading statements in the Warren Report, most of which have been based on wild speculation. Most of the speculation surrounding the assassination has obvious answers but those who trumpet "theories" refuse to see the obvious, as it disproves their theories and, in most instances, kills the sale of "tell all" books. My favorite speculative question was why the doctor who conducted Kennedy's autopsy burned his notes. Those who trumpeted this spectacular information never bothered to ask the doctor himself, who said that his notes were blood stained, and he did not wish for them to become some sort of macabre souvenir, plus he had carefully recorded his information before his notes were destroyed. If all the theorists are honest with themselves and their audiences, they will conclude that there is no evidence of anything other than a single gunman acting alone.

In reply to #3, if your judgments are correct, you may wish to enlighten others why Robert McNamara, the key architect of the U.S. war in Vietnam admitted that the Bay of Tonkin incident was a conspiracy, and why he apologized to the American people?

P.S. Do you really that the US and other governments are honest and forthright and there is no such thing as a conspiracy that is kept quiet?  Pravda loved people like this!  And the North Korean rogue appreciates these people, too.

I believe that Lee Harvey Oswald acted alone, because that's what the evidence I'm familiar with supports. If Jack Ruby hadn't murdered Oswald the next day- a strange occurrence, I'll admit- I don't think there would be any doubt. I will admit the possibility that there may have been another shooter, but that doesn't necessarily lead to the conclusion that the Mafia or whoever were involved. Lincoln's assassination, after all, was the result of a conspiracy involving several individuals.

Since there have been numerous conspiracies in American history (the sinking of the USS Maine before the Spanish-American War, the Gulf of Tonkin, or the USS Maddox Incident), it is entirely probable that the assassination of John F. Kennedy was, indeed, a conspiracy.  Here are some facts:

1. Joe Kennedy, father of JFK, made a deal with Chicago's underworld boss, Salvatore, Sam, Giancana to assure that Chicago's voters went "early and often" to the voting polls.  Also Gianacana made certain that dead people's names were used by repeat voters.
2. When Kennedy won Illinois, he was assured of the presidency.
3. The association between Giancana and JFK is indicated in the "Exner File" written by Judith Campbell Exner
4. As Attorney-General, John's brother, Bobby Kennedy launched a huge attack upon organized crime despite its help in getting JFK elected.  This investigation of organized crime by Kennedy enraged many of the bosses.  In his The Franch Quarter, a Sequel to The Gangs of New York, author Herbert Ashbury writes of Carlos Marcello, born Calogero Minacore of Sicilian parents.  He became the mob boss of New Orleans and was brought before Bobby Kennedy's committee to tackle organized crime.  After Marcello pleaded the Fifth Amendment, B. Kennedy had him deported. Undercover informants reported that Marcello made several threats against John F. Kennedy once he returned to the United States.
5. Right before Kennedy was assassinated on November 22, 1963, Dallas nightclub owner Jack Ruby contacted Marcello, and Tampa, Florida boss Santo Trafficante, about a labor problem he was having with the American Guild of Variety Artists (AGVA).  Jack Ruby, of course, is the man who shot Lee Harvey Oswald.
6. Sam Giancana was killed shortly before he was scheduled to appear before a U. S. Senate committee investigating supposed CIA and Cosa Nostra collusion in plots to assassinate President John F. Kennedy.  The man who came into his home after polic protection was called off one night was believe to have been known to Giancana because there was no forced entry and Giancana had his back to him as he fixed sausage and peppers, which he himself could not eat with stomach problems.
7. JFK's explosive relations with Cuba cost the Costra Nostra millions of dollars as Havana had been a type of Las Vegas for it.  Kennedy's death could possibly change  these relations.

There have been questionings of things that were written in the Warren Commission. For instance, while the Warren Commission concluded that Marcello was not involved in the assassination attempt of Kennedy, it also concluded that he was no mob boss, but, "a tomato salesman and real estate investor."  [Marcello, the "tomato salesman" has arrests that are a matter of record.  Also, his activities as a boss are recorded, too.]

The sinking of the Maine wasn't a conspiracy, it was a conclusion jumped to out of public hysteria and a desire to go to war.  It's not like anyone knew at the time that the Spanish didn't blow it up.

The Gulf of Tonkin Incident wasn't a conspiracy.  It was an ambiguous incident in difficult circumstances that politicians chose to use for their own purposes.

More importantly, the issues about both of these came to light fairly soon after they happened.  So how come there's been no one in government who has come forward and admitted the JFK cover-up?

Since there have been numerous conspiracies in American history (the sinking of the USS Maine before the Spanish-American War, the Gulf of Tonkin, or the USS Maddox Incident), it is entirely probable that the assassination of John F. Kennedy was, indeed, a conspiracy.  Here are some facts:

1. Joe Kennedy, father of JFK, made a deal with Chicago's underworld boss, Salvatore, Sam, Giancana to assure that Chicago's voters went "early and often" to the voting polls.  Also Gianacana made certain that dead people's names were used by repeat voters.
2. When Kennedy won Illinois, he was assured of the presidency.
3. The association between Giancana and JFK is indicated in the "Exner File" written by Judith Campbell Exner
4. As Attorney-General, John's brother, Bobby Kennedy launched a huge attack upon organized crime despite its help in getting JFK elected.  This investigation of organized crime by Kennedy enraged many of the bosses.  In his The Franch Quarter, a Sequel to The Gangs of New York, author Herbert Ashbury writes of Carlos Marcello, born Calogero Minacore of Sicilian parents.  He became the mob boss of New Orleans and was brought before Bobby Kennedy's committee to tackle organized crime.  After Marcello pleaded the Fifth Amendment, B. Kennedy had him deported. Undercover informants reported that Marcello made several threats against John F. Kennedy once he returned to the United States.
5. Right before Kennedy was assassinated on November 22, 1963, Dallas nightclub owner Jack Ruby contacted Marcello, and Tampa, Florida boss Santo Trafficante, about a labor problem he was having with the American Guild of Variety Artists (AGVA).  Jack Ruby, of course, is the man who shot Lee Harvey Oswald.
6. Sam Giancana was killed shortly before he was scheduled to appear before a U. S. Senate committee investigating supposed CIA and Cosa Nostra collusion in plots to assassinate President John F. Kennedy.  The man who came into his home after polic protection was called off one night was believe to have been known to Giancana because there was no forced entry and Giancana had his back to him as he fixed sausage and peppers, which he himself could not eat with stomach problems.
7. JFK's explosive relations with Cuba cost the Costra Nostra millions of dollars as Havana had been a type of Las Vegas for it.  Kennedy's death could possibly change  these relations.

There have been questionings of things that were written in the Warren Commission. For instance, while the Warren Commission concluded that Marcello was not involved in the assassination attempt of Kennedy, it also concluded that he was no mob boss, but, "a tomato salesman and real estate investor."  [Marcello, the "tomato salesman" has arrests that are a matter of record.  Also, his activities as a boss are recorded, too.]