It's not the media. It's because of the inequality and frustration in society between the haves and the have nots . It's the sickness in society where youths abandoned by non existent support systems fall through the cracks in this world and take their anger out in violent ways. If you look at history in many societies, unfortunately history will teach most people absolutely nothing - and throughout history it has taught us that the oppressors eventually defeat the downtrodden, then it goes " rinse & repeat " until somebody else in power defeats and unseats those oppressors and on and on.
The craziest and most borderline personality types who are unstable - since they get hopeless and can';t take it out on their oppressors - therefore then take it out on innocent people or each other who they come into contact with as they feel hopeless in their lives. Very sad. I'm not saying it's right that it happens- it's awful that it happens , however people feel lost in a lost world like this Moody Blues song states and they act out their anger in disgustingly violent ways.