Bottom line is: If you think it's okay to kill foreign civilians but that it's not okay when other people kill our civilians, then you're not coming from a place of morals or ethics, you're coming from a place of nationalism and a belief that American lives have more value than non-American loves. That, I think, is a disgusting and harmful worldview.
They started the conflict and they choose to target civilians. I see no reason why we should get our people killed to spare theirs in a war they started.