neversaydieChimpanzees in Uganda locked in eight-year 'civil war', say researchers
Here is the paper: https://www.science.org/doi/10.1126/science.adz4944 - it's interesting.
I noticed there was a respiratory epidemic that killed 25 chimps naturally quickly, one would imagine that would have quite a societal destabilizing impact?
My initial instinct is that they were just reestablishing social order among the group after such a dramatic event.
Edit : I just read the paper and the discussion does a good job at laying out the entire landscape that contributed to the disruption. Pretty fascinating but also totally explainable due to the circumstances explained, which in and of itself is wildly fascinating!
Sudden power vacuums are often filled by the most opportunistic individuals in human culture. People who are frequently more concerned with personal gain over the collective well-being of the group. It's why assassinating heads of state usually just makes the situation worse.
Plenty of people stepped into power vacuums not to make themselves rich but to save their nation Napolean, Tito, Cincinnatus, arguably George Washington.