You really are a dumb one. Roosevelt had been trying to get the country into the war, but was stuck by the Republican party. Pearl Harbor meant that he could put actual forces into the fray, rather than providing money, weapons, and supplies to the Russians and British. The League of Nation's problem was that it had no real military force to back up its resolutions, something the UN has sort of learned from.

Your idea of forward thinking is nothing more than a jingoism and blind fear. Your lame WW2 analogies don't even come close to covering that.
Sometimes I feel like my shadow's casting me