As many people say "there's no such thing as bad press". On the surface these headlines look very bad for NEM but anybody that looks into the details will learn it was the exchange NOT NEM that was hacked and they might be exposed so some new details about NEM such as it's amazing on chain multi-sig and smart asset support or the way the NEM foundation has responded to the hack which is unique and first of it's kind.

Most likely the rally was fueled by news that the exchange will be reimbursing it's customers in fiat. That means these XEM holders will be reimbursed with JPY and many are likely going to replace their stake. If the stolen XEM are effectively blacklisted, that means the supply decreases and the demand increases as people replace their stolen XEM.

In the end, nobody knows why really