Ah, fun with hypotheticals. Let's try one that's actually relevant. Imagine that a neighbor's kid, aware that the police chief didn't narc on his own son but dealt with it quietly as suggested from your pedestal, hosts a similar party that results in unintended collateral damage to an attendee. The police have no choice but to investigate, only to discover that the underage host was present at the previous soirees at the chief's house, too. The kid's folks are well-to-do, and his attorney wants a deal or his client talks. You cool with that?