Bellemare is not the Court Judge. He is the prosecutor (i.e. the lawyer of the accusation - in this case the United Nations). It is his job indeed to gather the evidence, assess it, look at all possible trails, make good sense of it all, package it and present it to the court in a way that leaves no room for doubt. Capice?
Shaffir to Herzog: Opposition failed to show leadership in political battles against PM (Haaretz)