I don't see logic behind not powering off an abusive machine, no matter if it's saturday night at 3am. The internet doesn't run on your schedule. If your server has been compromised (or not, heck we all know there are baddies out there), and it's actively hosting a phishing site, taking part in a DoS attack, etc, why shouldn't a provider be allowed to take action to protect their network, other users in general, and at the end of the day, perhaps the reputation of your site as well?

Blaming providers for the inability to secure your server is incredibly irresponsible. Unless service was interrupted because Hetzner misread an abuse report for another server (which is highly improbable and most likely is not what you implied in your original statement), you shouldn't ever be pissed that your host took action to prevent abuse from occurring.