Holy war

I beleive that holy war is an owymoron. This is because an oxymoron is a contradiction of terms that are put together to create another meaning. Since war is about killing. And holy is about god and following the path of god and all that is good then there can't be a war that is holy. If you are following the way of god and you are in a way religous or someone who is holy then you would follow the basic rules of whatever religion you are in. And in all religions it is forbidden to kill another human being and in some religions it is even forbidden to kill another insect of animal.