Woodrow Wilson was arrogant and bull headed but an idiot? Hardly. He did keep us out of war, that is, until the Germans sunk the Lusitania, then there was such a demand from the people he had no choice but to declare war.

Furthermore, if congress had listened to him, they would have agreed to his plan for the formation of a League of nations. But, thanks to Senator Lodge and other republicans who hated Wilson, they failed to act, and WW2 was the result.