You have a point, the media today is almost unescapable, unless you live under a bridge. However, it does not have a major effect on criminal behavior. Many children do in fact mimick what they see their heroes do on television, but this hardly causes them to go on to become criminals later in life. While studies have shown that exposure to violent imagery has short term effects such as raising heartbeat and blood pressure, the long term picture is cloudy at best and hotly debated.
For the most part, the real life environment and familial guidance is a much better predictor of how antisocial a person is likely to become later in life.
QUOTE
a Norwegian study that included 20 at-risk teenaged boys found that the lack of parental rules regulating what the boys watched was a more significant predictor of aggressive behaviour than the amount of media violence they watched. It also indicated that exposure to real world violence, together with exposure to media violence, created an "overload" of violent events. Boys who experienced this overload were more likely to use violent media images to create and consolidate their identities as members of an anti-social and marginalized group.
source Simply blaming violence in society on the media does not take into account all the factors that make us what we are as human beings.
This concludes post #1.