I misread the post. I thought it said "shooting folks you don't know" so I was about to say, what's wrong with that? That's what we do in combat, and under the right circumstances, it is unambiguous so we know who to shoot at. To shoot WITH strangers, I would just as soon avoid it not knowing who is going to put me in danger through stupid behavior.
Combat these days must be a lot different than it used to be when I was in the army.
I pretty much knew at least everybody's name in my company except the new replacements, and that was about it. But the rest of the battalion, brigade, and division I was going into combat with (not even counting air and artillery support) were strangers to me.
I'm really impressed that these days you know everyone you're in combat with that well.