I have thought for a long time that the level of violence in games, TV and movies have to be part of the problem for people on the edge of having a problem. Never have understood gun free households that don't have a problem with the violence games, TV and movies their kids watch.
On another forum I read a summary of a book (should have saved the link) on the cause of mass killings. I expected the usual hand waving and left speak but that is not what I got from the summary. They started by saying guns should be secured so someone on the edge would not have easy access but then went on to say that in the 180 mass killers they investigated that all were suicidal. They had no intention on walking away and would either kill themselves or plan on the police shooting them. They feel that more phycological access in the schools and society would reduce the mass killings. Then went on to say that neither party were willing to supply the funds to put a psychologist in every school to start fixing the real problem. I don't remember if it was in the same article but it was mentioned that psychiatric beds available were only a fraction of what they were 40 years ago.