Violent crime. Guns are used for crime a lot. So much so that when you weigh their criminal uses against their criminal uses, it can be easy to decide they aren't worth it on the macro scale.

Suicide. People who attempt suicide via jumping or something similar very often realize what they've done and bounce back. You can't do that if you've shot yourself in the head. While you'd think a suicide is a suicide, a less lethal method of suicide is better for society as a whole, because survivors often get their shit together.

Crazy people. Especially those of us who live in cities encounter unhinged people who just start shit for any or no reason. We want the stakes to be lower, so that I can tell the Karen screaming racial epithets at my neighbor in the middle of the night to go the fuck home and let me sleep, without worrying they're going to try and murder me.

Accidents happen. Much like "responsible drivers", " responsible gun owners" are less common than you think, and everyone thinks they are one. This is why institutions usually insist on things like mag safeties, that private owners detest. It's because statistically, a good number of people are just stupid sometimes.

People are literally just scared of them. They're dangerous.