In this culture, maybe we can't. I'm for disarming the public and law enforcement, the way they do in England. Almost 1/2 the guns in public hands in the world are in the hands of people in the USA. We are a land of lunatics.
And yet we (in UK) still get periodic calls here to arm the police. Most bizarrely in the recent fuss about the uptick in stabbings. Some people seemed to think that having a few cops stroll around visibly carrying guns would somehow magically change that. As if it were cops that were being stabbed.
Of course part of the problem is that there aren't any cops on the streets at all because Theresa May sacked them all to save money (OK, slight exaggeration, but it does intrigue me how the current conservatives are much more hostile to the police than were the Thatcher lot - the Tories now seem to view them as just another part of the state, ripe for being privatised).
I really think it's a tough problem that's mathematically like the US is trapped in a 'local minima'. To change anything about the situation requires changing all of it. Other countries are lucky in not being stuck in that 'well' in the first place. Especially island countries who can better control the flow of guns into the place (hello New Zealand). But when you are in it it's clearly very tough to climb out.
Which is why I find it infuriatingly stupid when people here (in UK) call for us to start sliding into that hole by arming the cops. It's much easier to slip into that well than it is to get out again.