I hadn't recognized the survivorship bias issue here. There are a lot of crazy groups that try to take over countries. Every now and then, one succeeds. This doesn't imply that being crazy will consistently lead to effective coups.

ETA: Arguing, "The Nazis succeeded despite inadequate rationality," is of limited value as evidence. There are a LOT of political groups out there, virtually all of them are fairly irrational in some respect, and a few are bound to succeed. Thus, arguing, "Rationality isn't important to success, because so-and-so succeeded," is only useful if they have been consistently beating out more rational groups.

On an individual level (and I'll put this in more detail in a separate thread) Tom is absolutely right that there are more important factors in individual success than mere rationality. This just fails to come across in his post, at least on my reading of it. The Nazis are, I think, a substantial distraction if this is indeed the point.