Gun owner here who would like to see the following: increased age limits, waiting periods, background checks and potentially training requirements for anything more dangerous than a .22.
I'd also like improved bullying response protocols for schools and potentially for parents to be held accountable for violent crimes committee by their children when they had reasonable steps available to them that would have directly prevented it, which could include failing to seek services, report risk, and giving them firearms. The standards for the latter would need compassionate and supportive application, but are absolutely geared toward situations where parents blow off risks identified by the school, like the Michigan shooting where the parents bought him the gun and didn't seem to take school concerns seriously. Schools already have to have safety plans and it's such a common thing now, that it seems superfluous, but if there's room on that front, I'm game. I'm also flexible and open to other ideas, even if I think the whole thing is hopeless. I would be very happy to be proven wrong.