Here is a thought experiment :

Say the pool operator is also the owner of Bank A (which has nothing to do with BTC). Now, a competitor of Bank A, Bank B, just announced that they will support BTC. The pool operator can now decide to "destroy" bitcoin and therefore cause severe financial loss for Bank B, leading to bankruptcy. If putting Bank B out of business results in gains (in USD), for the pool operator, that are greater than what he just lost in bitcoins, then it might be worth it.

Of course, this is very hypothetical, but it's not hard to come up with similar situations where Bank A is "State A" and Bank B is "State B".