Dead-metal, I agree with you to a certain extent. You are probably old enough, wise enough, and well-balanced enough (assumption), that you can't be so easily persuaded by things.
Kids aren't so lucky.. Look at the number of teenage pregnancies, smokers, drug-users, chavs and so on.
I'm sorry but there seems to be this mentality that these Teen Pregnencies and drugs have 'just appeared' since the media arrived.
This is not the case. Teen Pregnencies have decreased dramatically since 1997-although we still admittedly have the highest teen pregnency rate in Europe(!). Its to do with education. Other countries such as France and Germany play tons of rap music- but dont have the knife problem. Its to do with education, not the media.