Then what do you do when people still kill each other, ban something else?
Depends on what it is.
Freedom is messy, chaotic and dangerous. It requires maturity, wisdom and responsibility. It's scary. Maybe that's why some seem so eager to trade it for a facade of security.
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Again, guy, when I have to walk through metal detectors, past security guards, use a key card to move around the building at work because the bosses wanted protection from the guy they plan to fire next week, and have to undergo active shooter drills on a regular basis, I'm not "Free".
It is scary, though, that you never know which nut is going to suddenly start shooting things up because the voices in his head told him to, or because he hated the new Batman movie.
Maturity, Wisdom and Responsibility is making sure that crazy people and nuts don't get guns...
"Hey, how about we have them fill out a form to identify who they are so we can make sure that they aren't criminals or nuts?"
"Oh, no, that's not what a bunch of slave rapists who shot muskets 200 years ago wanted."
Now, that's crazy.