You guys realise that all crypto currencies can be programmed with rollbacks and shit using hard forks if they do find an extreme zero day exploit or something?

You guys realise that all crypto currencies can be programmed with rollbacks and shit using hard forks if they do find an extreme zero day exploit or something? The only difference between the decentralised ones and the centralised ones is that no one can actually stop a compromised chain from functioning while they deploy a hard fork. You can wake up one day to a severe ECDS bug and bitcoin will have to rollback anything that gets compromised afterwards (assuming it isn't a bug that makes the scheme trivially crackable and hence invalidates everything from the genesis block) as they patch up the software. It's not an unforeseen problem. You have to rely on the fact that the attackers also don't compromise your media outreach capabilities so you have no way of informing the world that the chain is no longer secure.