Tom and Jerry is banned in England because of the amount of Violence within the cartoons. Yet they still show the Simpson's. I mean even Noddy and little Red and Yellow Car was banned because of stereotypes.
I think with American Cartoons, its more aimed for a younger age mostly. With Anime, its a general age so anyone can watch it. But with Cartoons, its aimed straight at children and it doesn't help with the amount of violence that is involved. However, although there is violence in Anime's it isn't just slap stick violence, its about the battle between right and wrong so it has an extra point to story line.