What court? Presumably you're taking about the ICJ? It only stated that allegations of genocide is "plausible". The grandparent comment is about a human rights commission, not a court.

Also, the ICJ only has jurisdiction when states consent to its authority. And the UN security council can veto any decision. It's essentially a show court.

And again, people endlessly debate what is and isn't rape and murder. Judges and juries make the decision at the end of the day, and people still debate whether their decision was correct. If anything, drawing parallels to murder and rape only serve to highlight how subjective it is.