Why does america censor/edit so many "wrong" things?

I'm watching anime youtube videos about how america tends to censor and edit a lot of things the japanese originals did. while i do see some of the original as being pretty dark, such as people getting their legs chopped off by electric blades, others seem unnecessay to edit out, like in sailor moon, they had the girls talking about how should play snow white. in the original they had it be about who had the biggest breasts, while in the American version, it was about who had the best talent.

Why does america censor/edit so many "wrong" things?
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