The International Criminal Court is a farce. How can you tell other sovereign nation what is a "crime" or what "is not a crime"? It has literally zero authority to decide such matters.
There is indeed a long list of criticisms of the ICC.
The U.S., along with China, India, Russia, and many other nations, are not members and do not grant any weight to ICC rulings.
https://en.wikipedia.org/wiki/International_Criminal_Court#C...
Well a lot of international diplomacy depends on trade and associated meetings. If someone is sanctioned by the ICC then they can't move money or visit any member countries.
That is authority if you like it or not.
The International Criminal Court was created by a treaty between sovereign nations. These nations chose to for it to have authority over them.
The treaties a country signs up to is a good start on defining what constitutes crimes.
Germany in the 30/40s, no notes?
It has as much if not more authority to judge crimes commited in the member countries that gave it that authority than Trump has to sanction them in the first place.
Quite simply because you are allowed to set up international organizations by treaty.
How can a nation decide what is and isn't a crime? It's all made up, a "farce" to use your diction. We just choose to go along and build these institutions because living in lawlessness is worse.
Why should we believe in the fantasy of the nation state, but not in the fantasy of international law? It's all just social constructs to create an ordered society that stops the worst excesses.
You appear to be confused. Anyone can decide anything, the question is whether it is in their power to enforce their decisions.
Saying that they don't have authority to make a decision implies that there's some universal set of rules that internationally lays down what anyone's authority is - precisely the kind of thing you appear to be opposed to, because such a set of rules would likely need a court!