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Well, in all three of those media, often violence is unnecessarily glorified and glamorized, which makes it seem alluring to impressionable kids, especially those who are predisposed to that sort of negative influence. If they see movies or TV shows or go on websites which aren't suitable for their own age group, then it can encourage them to copy what they have seen. However, there are now many educational shows which are aimed at improving the behavior of kids, and helping them to be more positive, and some shows show how destructive violence can be, and discourage it, so that is a more positive influence.