The clear conflict of interest created when the Church puts one of its own clerics on trial is no different than a banker charged with fraud being tried by other bankers.  Anyone, whether pauper or price, who commits a criminal offense should have to answer the charge in a court of law - who one is and what one does for a living should not influence how a case is handled.  As someone once observed, justice must not only be done, but must be seen to be done.