If you allow usurpation even once, you have set a precedent.
That precedent, and the negative things that accompany the usurpation, do far more lasting damage than any temporary good the usurping provides.
Think of Banana Republics and their endless coups: one totalitarian regime after another, each done to stop evil, yet each producing a new, sometimes worse, evil.
That was good. Thanks. I would have said it differently, but I’m not 350 years old.