> we shouldn’t be the ones making that call, and no one else who should was stepping up in spite of being aware of the threat

If one patron starts beating another to a pulp, the bartender breaking up the fight does not signify a failure of the rule of law or law enforcement. You stepped in to help. It would be nice if you were given official air cover to do so. But I and most Americans prefer a system where the government has extra hoops to jump through to halt even dangerous speech.