Fucking hell. Unfair? It's unfair for YouTube to restore damage done to stolen and defaced accounts? Yeah, ok.
Anyway, you're assuming that YouTube went rouge restored the videos completely without input of the original uploader instead of the rightful account holder taking back control over the account? Why jump to that conclusion?
If your issue is with Youtube not deleting videos from their server, it's entirely in the account holder's interest for deleted videos to go to Purgatory for a period of time. YouTube HAS to plan for the case of hacks and mistakes because their users are humans. A very small minority will complain about "yar, yar, they said 'delete'" but the vast majority would say "I'm so glad YouTube undid the damage."
