Actually, the whole atomic bomb thingy does have a huge weight upon the whole super technology, and far out machinery thing to anime. I can't remember anything about it, but i do remember reading about it, and it made a lot of scence.
And about the far out sci fi stuff, and supoer natural power thing. America was built upon christianity, while japanese culture was centered around beliefs of many powerful gods who had a lot of influence on the people in japan. And in america, maybe if the rules to what we can put in cartoons wasn't so strict, then maybe we would have more cool and freaky animated films like they got in japan.
Like i stated before, listening to me is bad for your health, and i'm a very stupid little boy, so don't take what i say too seriously.