Then, imprison the JAG officers who prosecuted the case.
War crime creep is a barrier to killing and peace
During WWII, Gen. Eisenhower had 700 American G.I.s hanged for murdering or raping civilians. This turned out to be smart military tactics: as Germany faced defeat, thousands of German troops surrendered to the Americans, because they knew they would be treated humanely; the German troops fighting the Russians fought to the last man, because they knew they faced summary execution.