Yeah why is it that when countries go to war only the ARMIES fight each other?! I mean I think they should let me get my shotgun and hop on the next boat to the middle east and give me a tank when I get there. I'm trying to help, right?
The fact is that in every war, the best the loners can manage to be is assassins, if that much. If you want to join the war, you have to join a group, whether it be the army, air force, or what have you. It's not just everyone vs. everyone.