You just described most of the US's population. I mean, almost everybody fits your description of a mass murderer. Almost none them committed mass murder. You post is one long logical fallacy call the sweeping generalization.
Games have never been connected with that kind of crime in any objective way. I've looked for it and never found anything that could be said to connect the two from what can be called a good study and analysis. If you have a source on the subject, I'll read it if you post it. But really, most of your post seemed like a trip down nostalgia lane that had little to do with gun violence.
Jersey Shore? Maybe it's linked to suicide. I know I'd be thinking about it if I had to watch it. But mass murder? lol
https://www.npr.org/2016/01/05/462017461/guns-in-america-by-the-numbers
An objective fact that I find interesting: Gun ownership in the US has declined from around half of all households to around a third of all households. It's not as simple as taking guns away, because families are already shedding their guns. More likely the problem lies in who owns and who buys them. Maybe we need to figure out how to do a better job of screening out the mass murderer types. Maybe we have too low of a standard for who can purchase all those guns. I don't own a gun so I don't really care who has them. I just want them locked up in a safe according to the NRA's safety guidelines that most gun owners don't follow.
Store guns so they are not accessible to unauthorized persons.
Many factors must be considered when deciding where and how to store guns. A person's particular situation will be a major part of the consideration. Dozens of gun storage devices, as well as locking devices that attach directly to the gun, are available. However, mechanical locking devices, like the mechanical safeties built into guns, can fail and should not be used as a substitute for safe gun handling and the observance of all gun-safety rules.