One possible solution to the crazy person scenario is the use of counter gene drives. I think they discussed this in this podcast or elsewhere, but the idea is

One possible solution to the crazy person scenario is the use of counter gene drives. I think they discussed this in this podcast or elsewhere, but the idea is that if a species has a particular gene drive inserted, then you can create a new member of that species with a second gene drive that deletes the first and/or writes over the original CRISPR'd gene sequence.