This man is obviously awful and should face justice, though it's interesting that the war criminals who have held office for the past 60 years have not and will never get the same.
Milosevic ended up on trial at the Hague, though he died before his trial could be completed. Karadzic and Mladic are both currently on trial. Saddam Hussein was convicted of a tiny fraction of the murders he committed, but there's a scale issue there in that your punishment can't go higher than the death penalty. Charles Taylor is serving a fifty year sentence for warcrimes. It's true that a depressing amount of people do get away (Pol Pot and Idi Amin are especially glaring examples) and it's problematic in the extreme that someone like Omar al-Bashir might well die in office completely unobstructed by his indictment for war crimes, but war crimes trials can and do happen in the modern world to reasonable success.