>>515323607 (OP)
PNG had 7000 BC warfare (look it up on youtube) just 50 years ago, then in 2 generations they have now got handguns and granates.
Previously their warfare was kinda wholesome that tribes met on a large hillside and fought to first blood(either heavy injury or death) and then the beef was squashed. Now that they have modernity and technology the shoot and bomb their opponents.
Maybe this is a bit simplified explanation (atrocities could happened in the past too ofcourse) but there is something to it.
Ignore the blackoid in this video but this is the only full lengh clip left
https://www.youtube.com/watch?v=YWBziaWNQus