Two very particular issues drove Reagan's political conversion: fiscal policy and anti-communism. In the late 1940s, Reagan was facing the end of his career as a movie actor and was finding less and less work. He was upset because he felt that he had only a short window to maximize his earnings and ensure his future financial security and that the present 90% top marginal rate was unreasonable.
Reagan's experience as a board member and later president of the Screen Actors Guild also moved him politically rightward. In this professional capacity he dealt with a strike by a set builder union backed by communist sympathizers.
The idea of democracy began in Greece.
Hitler killed himself in 1945.
Unfortunately, he did not live long enough to stand trial, or to see Israel reborn. Pity.