Dont forget to thank me for raising the question because at first you gave me attitude.
Even the founder of the pool, Luke , is confused at times. He said its coming from his pocket which is not yet proven. Wk wants miners to work off the mistake but no transparency whatsoever. Is he a saint or hes asking us to trust him completely even after his own mistake? Trust should never be a requirement. Beside, withholding the information means he doesnt trust his miners.
I think it's great that you raised the question, and I think it might lead to change in the system. However, like I said before, I think wk made the right move in not announcing the situation. I feel that a lot of people in BTC are in it to make a quick buck, and if they have the opportunity to get a significant amount of extra BTC for free I think most of them will take it.
Obviously, we shouldn't inherently trust all pool operators, but that's why there are multiple pools. We all look for a pool we like and we hope we can trust them, it's not a perfect system.