Alice notices that George VI had five siblings. She asks Bob why that is. After all, it's so much more likely for him to have a number of siblings other than five. Bob tells her that it's a silly question. The only reason she picked out five is that that's how many siblings he had. If he'd had six children, she (or rather someone else, because it's not going to be the same people) would be asking why he had six siblings. There's no coincidence.

Alice notices that Earth survived the cold war. She asks Bob why that is. After all, so much more likely for Earth not to survive. Bob tells her that it's a silly question. The only reason she picked out Earth is that it's her home planet, which is because it survived the cold war. If Earth died and, say, Pandora survived, she (or rather someone else, because it's not going to be the same people) would be asking why Pandora survived the cold war. There's no coincidence.