Why do people say bad words?

Well, they hang around people that say bad words, and they say to themselves, "Oh, that's cool, let me try." At first they're scared, but then, when they get the hang of it, they do it all the time! When people hang around someone who says bad things they start saying it. Then that person is pretty much scared for life with bad words. When someone gets the person mad bad words will just start coming out of there mouth.
B/c they have nothing better time say or they have fellings to express and dont know how