The vast majority of people who own guns don't go out on killing sprees no matter how stressed/angry/sad they are. []
The vast majority of people who own guns don't go out on killing sprees no matter how stressed/angry/sad they are. The majority of people who play video games don't go out on killing sprees no matter how much that game rewards violence against others in-game.
With this logic, we may as well outlaw just about everything in existence because I'm sure if you look at everything in your house/room, the majority of it will have been used, somewhere in the world, to kill or attempt to kill somebody.
It's fantastic saying things like "let's stop [insert group of people in society] from having weapons because they might commit the same kinds of crime, but the truth seems to be that some people just do it. There probably is a scientific explanation for it and we will probably know a lot more about it in the next 10 years or so. But, right now we don't really seem to know and all of this finger-pointing isn't getting anybody anywhere.