A lot was learned from the way WWI was ended and WWII ended a lot differently... the Marshall Plan for instance was implemented by the west and the USA, and then there was the USSR's way. There is a time for taking an isolationistic and/or nationalistic attitude and there is a time to take more of a world view. It takes wise people to know when which approach is appropriate. History has shown us that fanatics or idiots aren't really capable of even understanding all the issues, much less making wise decisions. Many times it is a matter of what is the worse that could happen and could you live with that; meaning there are not always good ways of handling things and you just have to make the best of the situation.