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.