I actually agree with OP 100%. This is Mt. Gox's responsibility to make right. Especially in light of numerous complains regarding security well before the plummet. The fact is they were in over their heads and they dont know what to do now. Who are they to roll back a market?

THEY allowed their system to be compromised. They alone. I dont care if it was an auditor. That auditor had authorization to access their files and was acting on authority of the owner. No difference. I have zero pity for Mt. Gox. The only right thing to do is to reimburse the original owner for everything that he lost (since there arent enough bitcoins available, they need to BUY them for him. Period.) and the OP be allowed to retain the bitcoins fairly purchased. If I had money in Mt. Gox at the time, I would have been furiously trying to buy, too. There were plenty of posts here that thought it was a legitimate selloff. The OP did nothing wrong. Period.