The story of how Hitler became a dictator is set forth in The Rise and Fall of the Third Reich, by William Shirer, on which that post is based.
History calls to us if we listen. Amazing, we still make the same mistakes, over & over & over & over & over & over & over & over & over & over & over & over & over & over & over & over & over & over & over & over & ahhh, I think you get it.