What's going on in the world?

Last 2 weeks ago theater Massacre,just today when I wake up,I read again news gunman killing people inside a temple.What the? Are these people really crazy or is this one of the side effects of too much television,movies,games and so on.I'm not sure however the act of these people is just unbelievable.The worst thing is that innocent people get killed.Are they doing this for attention?or simply crazy?