All primates are resource competing, so outcompeting is also drinking up their milkshakes. But, again, that’s the baseline.
Non-conclusively, from my lay understanding, the tail end of falls into general bi-lateral competitive practices and breeding rates leading to ‘us’ not ‘them’. All columns all the time, not one crisp incident or behavioural change.
[And there’s no indication that ‘they’ geno-rapo-ate us any less than we them… if being slightly better at mass murder was the difference, then yay for our side?]