I'm sorry I should have clarified the problem.

My problem is that MtGox will not reverse the transaction to Dwolla.  If they don't want to do business with me that's perfectly acceptable and their right, but to hold $100 dollars in some black hole unless I provide them with further information -- and to refuse to simply return the money to Dwolla where it came from, that is unacceptable.

The fact that a company would take that stance is proof enough that they can't be trusted with personal information.  Honest companies don't act in that way.