My sense of Hitler's skewed view stems from his personal sense of insecurity, the abuse he suffered at the hands of his overly harsh father, and true mental illness.
Hilter's dream of creating a super-race seems ironic to me because Hitler was not a blonde-haired, blue-eyed example of "purity" himself, and yet he believed he could create a super-race by achieving racial purity.
Hitler's desire to be an artist was never realized, a grave disappointment to him. He traveled about, painting to make money; the economy was bad, and people competed strongly for jobs. Disappointment, financial struggles, etc., can push people over the edge, and Hitler may have been radically close to that edge to begin with. Hitler was becoming enamored with the socialist society in Austria, and research indicates that his hatred for the Jews began to intensify at this time. Perhaps it also came from things he heard growing up. Besides the Jews, Hitler targeted anyone else he felt would do damage to the "gene pool" he hoped to create. His ethnic cleansing included the Romanians (gypsies), Catholics, homosexuals, political dissenters, etc.
One thing is sure: when dealing with mental illness, nothing makes sense because the mentally ill do not see things the way the rest of the world does: they have a different reality and their own set of rules. It is amazing and horrifying that one man was able to lead a nation to kill so many innocent people.