IIRC from Robert Heinlein's The Moon is a Harsh Mistress. The just so story is when the govt's monopoly on violence is devolved to individuals, people will police themselves.
We now know empirically that a well-armed society is certainly not polite.
Indeed, that is a nice sentiment, but not borne out by the actual data.
It's more like being armed makes not all, but far too many people, think they can be as much of an ass as they like at any time. It works fine, right up to the moment it doesn't and they get put down; but they never think of that in advance, so it doesn't stop that subset of the population being asses (or just shooting up the place), and the rest of us having to live life watching our sixes.
There's a reason that most civilized societies moved past it.
So it is censorship that we don't sell alcohol in schools?
It is censorship that we prohibit open beverages in automobiles and airplane cockpits?
Yikes. I expect this kind of "all regulations bad!!" nonsense on other social media, but sadly, starting to find it here too.