So, who or what do we blame for spree killings, and what can we do about it?

Sincerely, I have no answer too. It becomes very humorous each time I see people attaching violent video games or movies to violence in the real world. I mean, what's the correlation there? There are people I know that love violent video games and are more sane and happy in the real world than some who don't play violent video games.

Sometimes, I try to convince myself that some of these violent shootings have the government's hand in it remotely. I grew up in a place where you are more likely to be illegally shot by cops than by bandits. Now I wonder if "gun controls" should also be enforced for cops too?

You did a very good exposition here. Nice piece.