MtGox it's sweedish for : making under the table deals to sell user information
I would think MT would be able to think a few steps ahead in the chess game to not do this....
I wouldn't be surprised if someone (government) has an identity that only exists on MtGox and waits to see it in the wild....
They would use that information to shut down MtGox... I am sure MT knows this...
The excuse of a security breach only works so many times... before a pattern emerges__
So, it would be highly doubtful that what you suggest is going on.