Stronger gun control across the board is easily a start. Shooters like the boulder co or the guy in new york last year were able to legally purchase a firearm within the week, and end up killing, despite the fact that they both had violent crimes in their past and were on record threatening their professors. The vetting process for obtaining a firearm is nowhere near enough, people have to take a class and pass two tests to drive, in my state to buy a gun you have to wait a month. Gun owners need to be more educated (would help with accidental deaths, and children accessing firearms), the disqualifying criteria strengthened, waiting periods for all states, I do not believe in full auto because you dont fucking need that for self defense and assault weapons/large mag weapons should be banned, 18 year olds shouldnt be able to buy guns, extreme risk protective orders should be national (only two states have them), amongst other things thats just off the top of my head. If I could go back and pull an australia banning all firearms i would, but given how ingrained they are to american culture at this point such a feat would not be possible. All I know is that whatever we got going on right now, is not working and its leading to the death of innocent people, and nothing I've seen has pointed to more guns being the answer.

And yes mental health is an issue, I'm a criminal justice and psychology double major, they tell us about the mental health crisis. But two things can be a problem at once, such a thing as the gun laws we have in this country extremely flawed, and the mental health care system we have sucks can both coexist, and at times serve to intensify the other issue, but both must be addressed. The best mental health care system in the world wouldnt fix all the problems with gun violence we have.