Ever wonder how children and young adults learn how to use firearms for mass violence - they didn't learn that from the NRA nor a firearms training class - they learned it from violent "interactive video games.
Continuously interacting with violence through these games, along with using automatic assault firearms to kill, teach children and young adults to become more violent.
That is the problem with todays society - we have over 300 million guns in the USA - FBI reports that 200 million are owned privately and the remaining are owned by the government and law enforcement.
If gun ownership was the problem we would have thousands of mass murders every day - it's not.
It falls back on the parents who let their children interact with violence through these games that is the problem.