Why do citizen defend their nation?

Answer 1

Who else will? Think of each nation as a family, within a neighborhood. They are required to take care of themselves, so if one family is endangered they must protect themselves with family members ( citizens). Also, a family may see it in their best interest to to try and take resources from another family so they pursue aggressive actions to do so, the other family fights to hold on to their possessions . Some families form a group to ensure more protection from others. An agreement is reached that states an attack on one of the group is an attack on the entire group. Members of a family, just like yours, become accustomed to a certain way of doing things, food choices, entertainment, a basic way of life. If that way of life is threatened by another and the danger exists that your way of life may no longer exist and you then are required to live by other families way of life you resist, especially if your best interests are not the same as the other family. You are inclined to defend your lifestyle when it becomes clear someone else regards your way of life as not important and you are delegated to follow others