Alvin came out of a rural, gun owning culture, and although his family was quite pacifist, the hill culture of Scott-Irish was anything but. Then of course, he did go through military conditioning, and was surrounded by his social group that had self selected themselves to fight. It wasn’t that much of a jump for him.
You’re not familiar with Alvin York either I see.
You should read about him.
Look into how many times he vasillated between pacifist and citizen soldier.
pre-WW1, WW1, post-war WW1, pre-war WW2, WW2, post-war WW2.