I see your point.  The International Criminal Court in the Hague is supposed to lay charges and oversee the cases.  https://www.icc-cpi.int/cases

Sometimes they even do so for white war criminals as per Slobodan Milošević re. crimes in the former Yugoslavia.  

But it's all a voluntary thing and states, like the US, can choose not to respect or even sign on to the court.

It at least provides a measure, in some cases only of how far we have fallen, but also to a state to which we might aspire.

(BTW - you named George Bush twice; personal vendetta or referring to the father and the son ...).