We could start with "if someone keeps telling people they're going to shoot a bunch of people, they can't buy a gun" and go from there.

Requiring training, background checks (no loopholes), an interview and a license would also be a good idea, though it requires a bit of care in implementation.

There's a few things that are pretty close to harmless to moral gun owners but would reduce the incidence and severity of gun violence.

Whatever they do in those in those other 200 countries are clearly both common and sensible.