Well here's a question. Where does violence and aggression come from? Is it really video games? What about violent movies that portray John MacLaine who kills 60+ baddies with pistols to assault rifles to rocket launchers? What about books? Read a book and it's left wide open to our own imagination. Now why is it always "assault rifles" people are using? In videogame shooters I tend to see more shotguns then anything else.
Also when a kid turns on their parents or acts out in extreme violence maybe there are issues at home! However when the parent or guardian gets on tv they sure as shit aren't going to admit to abusing their children. Which is another question why again why are parents letting children play these games in the first place? They are mature rated for a reason. I have a 5 yr old and I. Let him ay sky landers angry birds and Mario, but I always monitor him and limit his play time. Unfortunately parents use these toys as simple cheap babysitters.
Also I find it funny how the NRA are quick to blame videogames when their precious "toys" may be banned. Why not run over one right to try and save your own. I wonder if the police play GTA and that's why sometimes they unload 50 bullets into victims that aren't even carrying a gun. Then again I wonder how many violent games Hitler played as a child to make him kill off 6million people.
Basically even if they banned videogames completely there will always be violence. That added with way to many other factors be it family, gaming, movies, bullying, other environmental issues, or even mental illness how can we pin point these mass shootings to one item? O well guess shit just rolls downhill.