They can have their dogshit gun laws back when they’ve finished solving the problem
You don't mean that though. No liberals do. That's why conservatives won't budge on this issue, because they know whatever ground they give will never return and liberals will always be pushing for more.
And honestly, the mass shooting stuff is our best chance at convincing conservatives to change, because they're actually occasionally affected by that crap. Even with the increases in mass shootings, the vast majority of gun violence is down to crime, which mostly affects poor, non-White people living in urban areas.
This issue is really complex. It's affected by different cultures in the U.S., political alignments, demographics and wealth levels. The mental health stuff is only really relevant if you're talking about how psychological and sociological issues contribute to extremism and social isolation, but most people just picture some schizo on a bad day, which is a microscopic drop in the bucket (and most people with severe mental illnesses like schizophrenia are not actually vioelnt, that's a bad stereotype).
I understand why most liberals want to get rid of guns; it's just that that's not actually the problem, and conservatives know it, so they fight back hard and we get nowhere. Sadly, I think more conservatives have to become victims before there's any traction in terms of putting appropriate safety measures in place that still afford conservatives the freedom to practice their favorite hobby.
So it goes. Meanwhile, we're killing the planet. Small potatoes in the long run....