Finding justice for the “crime of crimes” is an arduous and fickle affair. Genocide inevitably reaches from the corridors of power, where vested interests will do their best to mitigate culpability, to the traumatized lowest rungs of society.
With their leaders compromised, the authorities in Myanmar can not be trusted to independently administer justice or discover the truth behind the alleged genocide of the Rohingya any more than Pol Pot could be relied upon to account for atrocities committed by the Khmer Rouge.
Usually it is a military, foreign correspondents or aid workers who get in first and report. Outside help arrives and efforts to prosecute are internationalized. It’s tried and tested.