Mass shootings aren’t really a big deal imo, they’re just one of the many expressions of murder (especially murder-suicide), popularized intensely by the media because people eat it up.
Once you consider it just another expression of murder, and that rate has been going down for many years now, it’s just not a huge deal. The way I see it, forensic science caught up with the general serial-killer. When someone prone to anti-social behavior has a choice of “kill slowly, get caught anyway, die or rot in jail” or “kill many, go out in blaze of glory, get televised” I think the matter is simple to make up.
Hell i’m not even a huge gun advocate, but people prone to murder very much like to follow popular trends. The trends can be affected by state law, of course, but the end result is always murder, and the focus of law should be in generalities, not specifics.
Just look at Britain. Sure, they got rid of a lot of guns in circulation, but all the criminals just went to knives, and the knife assault rate ended up matching the earlier gun assault rate. Australia is still having mass shootings (any event where 4+ people are killed or injured)…and the fact that the vast majority of mass shootings here are gang related is also a challenge.
I guess my point is, it’s not a necessity. The US, outside of gang zones, of which there aren’t many and they’re always shrinking, is a very safe place to live. The overall murder rate gets lower and lower every year.