What is a War Crime?

Does the percentage of women and children define what constitutes a war crime? How many times can civilians be the primary target before we finally acknowledge that civilians really are the target? This sequence of events bears an eerie resemblance to what began WWI. Each side decides it has to act either preemptively or to excalate the violence in response to some perceived threat. We are all becoming blind. Can we, as Americans, claim no blood on our hands when we overnight hundreds of bombs to the Israeli's, even lying to intersecting countries about our cargo? Will we be shocked to learn that we are culpable? Too many questions. Not enough answers.