Atlas, given your stance on property rights, I think you would have to agree that as soon as someone cedes control of their property (be it USD or BTC) they must live by the whim of the controller.
If MtGox decides to keep your BTC and/or your USD, sucks to be you. Caveat Emptor.
Your world view is (a) juvenile and (b) boring.
Well, there is little force to prevent Mt. Gox from stealing besides the threat of the collapse of their business. We have to look at reality here.