Cultural relativism aside, I’m sure we can agree on “terrible” if we talk it out. I’m not asking for a “well X country is worse than Y country, so, Y country isn’t THAT bad”. I’d say for this discussion we can go as far back as 1800 for “past” as I’m currently convinced there isn’t a country with a perfect track record going back even that short a time.
Uncontacted tribes probably haven’t done much.
What happens in the tribe stays in the tribe
How do we know? We haven’t contacted them.
They likely have warred with other tribes.
Maybe, maybe not. Would have to contact to find out 😉