As always, word choice is crucial when the debate is so intense. Substitute "extremely radical" for "insane" and I believe that my point holds. There were no cultural, political or economic forces that made it likely that the Germans would try to exterminate all Jews, but it happened because of one man - who wouldn't have received any support if anyone less extreme had been able to address what a large number of Germans considered a legitimate grievance - was able to gain a following.

The longer that perceived grievances go undressed the more likely the aggrieved are too turn to extreme "solutions." And the fact that the majority of people think "there's no way some one would round up and exterminate an entire race of people" or "some radical hiding in an Afghan cave can't attack America" doesn't change that.