Two Restrictions. Nagel argues that whether war is moral depends on how the war is fought. Some things should never be done in war, such as murder of innocent civilians and killing medical personnel. There are two kinds of restrictions of behavior. First, only certain kinds of people should be attacked. For example, only soldiers or paramilitary armed fighters can be attacked. Children and other innocent civilians cannot be attacked. Second, only certain kinds of attack are acceptable. For example, it may be OK to shoot someone, but it is not OK to torture someone or poisoning a water supply. The first is a restriction is on the class (or kind) of people to be attacked and the second is a restriction on the type of hostility that can be used.