Ignoring your initial tone, I see what you're saying, and agree these aren't identical cases. Though it should be emphasized they only payed out to the victims because Iran brought it to the international courts and they wanted to settle. They never, as you said, apologized, or even thought they had any legal obligation to the victims. Feels like your splitting hairs with "Russia denies involvement" as being dramatically different -- both seem like terrible events that neither super power really feels responsible for despite being the ones who put those weapons where they were without legitimacy.