Well, the solution to the paradox of tolerance is to utterly void the social contract with those violating it as they have already seen fit to void it themselves. So the response is to immediately see their escalation and escalate beyond all reasonable measures. The wrath of a good man is not to be tempted and the fury of a patient man is to be avoided at all costs. Both wrath and fury are the appropriate response to one side of a social contract breaking said contract.

These folks will push until the dam breaks. When it does, all will be washed away by wrath and fury.

The way I think about it is that no system can survive unchecked bad-faith internal actors.

The problem is that wrath and fury of ordinary men will be countered by fascists with more power. And it can go to the very top. The entire system is designed to keep the chain of command, it doesn't give a shit about what you think your "social contract" is. Go figure how many criminals Trump has pardoned.