I can't truly understand the meaning of the term "War Crime".
War is a war - people are killed there by weapons, and not only soldiers but civilians as well. The essence of any war is killing enemies to take superiority, and if killing only soldiers on battlefields for some reason can't bring needed outcome of the war - then there could be acts like Holocaust or Dresden bombing, and of course on any war there are crimes done by common soldiers. We have now some international laws about how the war must go on to harm civilians the least - but they doesn't work, and would never work because despite all rules and laws if one side is losing it will rather try to win via violating rules than surrender. That's just the nature of humans and of the war.
So I believe that people can complain about war in general but not about that civilians are dead during the war, or prisoners are killed during the war.