dog genetics are probabilities. Your dogs are likely able to suppress their instinct but find the right trigger and your dogs are very likely to be ripping out an animal’s throat, including a human’s.
BSL works because it is also based on probabilities, specifically the probability that a group of closely related dog breeds are all likely to exhibit the same behaviour.
The problem with pit bull type dogs is the breeding that makes them attack a target’s most sensitive region - the neck. Better to have all related breeds removed that run the risk of yet another child dying because someone could not be arsed to contrôle their dog.