More humans have been killed by cows, but we developed no evolutionary fear of cows.
Homo sapiens winning a deliberate "war"- assuming it involved the larger part of the whole homo sapiens population- should only have resulted in the end of the other species, not homo sapiens developing an evolutionary fear.
Snakes and darkness are the kind of things that lead to evolutionary fears, because they were indomitable, unlike neanderthals. And only people who feared them lived long enough to procreate (that's why they're evolutionary fears), others died by snake bites or tripped in a dark cave.
Neanderthals weren't an existential threat because homo sapien didn't survive depending on their fear when they co-existed with neanderthals, they survived and outlived them depending on higher intelligence.
War doesn't lead to evolutionary fears.
Robots that look like humans are unsettling because we expect a million more facial cues than they display. It's the same reason why a smiling killer looks more disturbing than an angry killer, only because one of the two looks unnatural and evades understanding.
