The database was compromised, and accounts were altered increasing the cash balance in certain yet unidentified accounts. These accounts then purchased bitcoins and withdrew them.
This information has been kept secret from you because Nobuaki Kobayashi, the court appointed lawyer in charge of the mtgox bankruptcy, wants to close the case as easily as possible. He doesn’t care about your return. But the damage can be undone.
There may be accounts with inflated cash balances that may be reduced, increasing the return to everyone. You need to speak up. If you don’t make yourself heard, this matter will be disposed of as quickly as possible.