In accounts of men in battle, there is an incredible adrenaline rush from group-versus-group conflict. The fervor and passion of partisans is clearly rewarding; and if it's rewarding, it involves dopamine; and if it involves dopamine, then it is potentially addictive.
I don't like alcohol, but I still like to mess around with other stuff occasionally. I think it's important I take mushrooms and acid. They're certainly not addictive, so I can't rule that out.