People want their answers to be simple. In this case, if you can say there's a good side and a bad side in a conflict, you can pretend that verbally supporting the good side no matter what is good, moral praxis.
There's also the same question the other way around. People seem to have real trouble when they can't find identifiable goodies and baddies in this conflict. So they close their eyes to what they don't want to see.