The USA won't do anything about it because the USA is also guilty of heinous war crimes, crimes against humanity and massive violations of human rights at scale - in fact, it is the worst criminal on the world stage when it comes to un-prosecuted war crimes... so Israel facing justice will only mean that the USA will face the same justice, and we all know that there is nothing more heinous in all the world to an American than to be embarrassed by their state facing justice at the hands of any other international entity.

But the terrible tragedy is that this situation is not going to resolve until these countries actually prosecute their war criminals, who have been getting away with it in the current context for 20+ years. Which means the only ones with any power to do anything about the USA/Israels' war criminals, are the citizens of those countries themselves - which is why the situation is just so dire.

Until there is a real appetite for prosecuting ones own war criminals instead of bleating like sheep for the blood of perceived enemies of other states, there will not be the moral stance/altitude required for Americans to do anything effective about the war crimes of any other nation.

Until Americans prosecute their own war criminals they can do nothing effective about Israels', Russias', Ukraines' war criminals, either ...