One of the most detrimental forces against free speech have been the unwritten laws. As mentioned above there is "self-censorship"; in addition, there is what is euphemistically termed "politically correct" speech and wording.[ By whose "politics"are these guidelines made, by the way?]
One of the great Americans of old, Henry David Thoreau wrote, "That government governs best that governs least." Unfortunately, with the plethora of irresponsible people, some governments are moving stealthly toward police states and individual rights and privileges are being eroded.
With the criminal element increasing, what can be done to protect national security? Franklin Roosevelt was correct when he told Americans in the 1940s that the greatest thing they had to fear was fear itself. Out of fear comes censorship and "patriot" acts--and even dictators.