Guns should be almost totally banned
For the vast majority of people, there is no good reason to have a gun. The UK changed its gun laws substantially after massacres in Hungerford and Dunblane (e.g. see https://edition.cnn.com/2012/12/17/world/europe/dunblane-lessons/index.html ). Farmers can still get shotguns and there are some rifles for hunting. But, for example, the laws recognise that no typical citizen should be allowed a handgun.
These changes seem to have helped - at least somewhat - as one would expect. And the only down-side is so minor it can be ignored (some people who liked hand-gun shooting, as a sport, were disappointed).
Arguments such as home defence have no real force. Obviously, I would be annoyed and/or terrified if someone stole my posessions or attacked me in my home. If I had a gun, I might be tempted to point it at them and there's some chance it would go off. Would that make things better? No - instead of a burglary, we'd end up with a burglary and a shooting.
Why the USA still has so many guns is mysterious to me, and distressing. Depending on how one parses the sentence in the Constitution, there's not even - necessarily - a constitutional right for individuals to bear firearms.
There's presumably a separate, valid discussion to be had about video games. But it's not "either or". I'm sure plenty of shootings are done by people who don't play video games much.