What kind of an inadequate question is that?
Any school shootings anywhere are not ok, neither are the group beach ones. Not one. Pure evil.
The big picture problem is more likely "Hi-tech-psyops Hypnosis"; yet you won't advocate to ban cellphone eye scanning and central nervous system accessing cameras, laser identification and "power of suggestion" infiltration psyops with first person shooter games, that have trained such school shooter perpetrators you so fear, with, *allegedly. Are your ears Ringing?
GWEN Towers not as necessary with StarLink Satellite Technology, also allegedly.
Ban access to cellphones under age 25 and make it a felony for anyone but military personnel to Train with Video Game Simulators of Violence, which begets Violence en masse.
Weapons don't use themselves. It's an operator desire problem, not an inanimate object problem.
Your suggestions for solutions are inadequate and folly, even if your heart is "in the right place."