From Thomas Sowell's 2005 book "Black Rednecks and White Liberals", Page 201:
The racial fanticism of Hitler and the Nazi movement, which spread to the German generation of their day and led ultimately to the Holocaust, were not historically distinct characteristics of Germans as a people. On the contrary, the rise of such a man as the leader of such a people should serve as a permanent warning to all people everywhere who are charmed by charisma or aroused by rhetoric (emphasis mine - DW)
Yes, the case of Germany stands as an object lesson for those who care to see it. Leftists are too busy wrongly conflating the right with the National Socialists.
Ironically, the lesson’s lost on those who will be first consumed by the mosnters they applaud and vote into power.
Sowell’s one of the best and brightest intellects of our time. I have almost all of his books, including the one you mention. They are source of reference and inspiration; a reminder to see clearly and to always speak the truth.