you're clueless. they weren't trading. they have global obligations in the yen and swiss franc and always had excess capital of 43 to 400 million at all times. they even self-reported when they realized there was an issue.
What stealing? My take on the fine is that they were supposed to segregate a certain amount per currency and they were segregation by an aggregate amount. It's unfortunate, but why don't you try to make sense of the dozens of SEC rules and regs? IB discovered the error and corrected it. It's BS that they would get fined for this.