Still and all, I think we must attempt to understand the climate of command these decisions were made in before we label the decisions. Unrestricted submarine and surface warfare meant the starvation of hundreds of thousands of Germans during WW1 and right up the the signing of the peace treaty in 1921. That was not determined to be a war crime then. Those who drove the allied war effort knew their history, and also knew their responsibility. Both Germany and Japan were working on nuclear weapons as well, the war had to be won before those devices could be brought to bear. As for the "It makes us just like them!" Dept., No it doesn't, that is just more PC moral equivalency.
"Sir, the enemy is attacking!"
"For God's sake. don't shoot them Laddie, it will make us just like them!"
The Americans got back only a fraction of their men captured by the North during the Vietnam war, yet have gone out of their way to persecute their own officers who knew that many were shipped off to the USSR, interrogated for their technical knowedge, then disposed of. The US did not want to rock the boat politically in their relations with the USSR, or domestically. Any country capable of doing this to their own soldiers (in other words, all countries) is not going to shed tears over any overexuberence in the application of force to a target list. NOR SHOULD WE.
Tom