They initially select the target at 3:36. Radio says the group has weapons, so they're identified as insurgents and targeted. I can't exactly tell, but it looks like they have AKs and an RPG like the radio says.

I think the war crime is at 9:31. They kill unarmed people picking up bodies. Maybe they figure they're insurgents too, but that seems like a wild assumption, also the drone operator sounds trigger-happy. Is there any good reason for this?

People do care, including Americans. These Mid East wars aren't popular partially because it's known or even assumed that US soldiers are committing war crimes there.

> also the drone operator sounds trigger-happy

That’s a manned AH-64 Apache attack helicopter with a pilot and gunner.