Not sure how many (if any) layers of sarcasm to strip away, so I'll just say: Hank Paulson's decision not to bail out Lehman was not OK regardless. His former employer simply might have informed that incorrect (for the US/world in general) decision. Simple bias; had GS been on the chopping block, I can personally guarantee he would not have advised letting it tank.
Human nature; exceptional behaviour from Paulson, which seems unlikely given the kind of person he had to become and loyalty he had to exhibit to get to be at the head of both GS and the Treasury.