Well the Sovereign Bitcoiners or Natural Law Bitcoiners will argue that the only thing you really aren't allowed to do is kill others (sometimes this is adapted to "thou shalt not steal")
I quite like that way of living. But as you say, how does that hold up in a society that does want protections from the vilest of things which only just fall short of taking someone's life?
I guess there is no answer. We pray that once Nostr is attacked in such ways that we find ways of countering vile actions. I am sure someone clever will come up with some kind of mechanism for doing so.
As A Antonopolous once said the assymetry of evil means that good should win. The answer to "bad speech" is "more free speech" and not less. This is important to understand...