you are creating a precedent here. It is totally a centralized decision which will set a precedent in the future when and if crypto will be accepted as global currency. It will create the option for big entity to bring his mining power in action whenever a rolling back will be in his favour. This is an unwritten rule. Crypto stands for irreversibility not for lets take another look and if it doesn't suits us lets rewrite history by using latent forces of mining whenever a rolling back suits us.
crypto will never be accepted as a global currency with these types of things happening on a regular basis. I can understand not wanting to roll back the entire blockchain, but the patch that just rolls back the hackers transactions is a very reasonable solution. There has to be some form of "justice" or anarchy will reign and no one outside the crypto community will take any of this as a serious option.