Most people who own guns legally now won’t care about stiffer background checks nor do I. We don’t obviously and will likely never agree on the actual physical weapons themselves, but that is a different debate.
However, increasing stricter measures and even if were to go as far as a total gun ban, criminals would still find a way to get guns. It’s the semantics of believing moral debate causes keen judgement. It doesn’t, history is proof of that. We humans are intolerant of opposing factions, your value is judged by your ability to hate the other side more.
Remember, millions of legal gun owners have millions of guns and billions of rounds of ammunition yet commit no more mass shootings than your average mentally ill shooter. If legal gun owners were the problem, we’d know a.