I think the intent is to keep the bad actors from knowing exactly how they were nabbed so they don't know what to do differently the next time around.

I would be amazed if they aren't punishing a lot more innocents than guilty, though. These days the government loves to do an end-run around the 5th amendment--innocent until proven guilty should apply to all government or government-directed actions (I consider the bank closing your account because you did something the government considers suspicious to be a government action), but we have been using it for toilet paper for quite a while now.