I wouldn't. After seeing such tremendous security accumen from CitiGroup, I wonder how you can blindly trust.
But the larger point is, even if you can mostly undo the damage, you have a much harder time restoring trust. The money doesn't need to be lost. If you create enough of a panic to trigger a run on banks, you've achieved your goal, too.
I would trust more in the people who design our SWIFT and other transaction systems.