This is unequivocally false and we have many examples of deformed individual from 8000+ years ago being not only bruised but cared for until a long age and in many cases decorated. Have you ever considered the possibility that unless absolutely necessary or atleast in most societies, most would care for the weak, sick, deformed, mentally ill. Your mindset of history comes from an hobbsian notion of the rough and brutish hunter gathers which has absolutely no scientfiic base

https://www.nationalgeographic.com/science/article/deformed-skull-of-prehistoric-child-suggests-that-early-humans-cared-for-disabled-children

https://www.nytimes.com/2012/12/18/science/ancient-bones-that-tell-a-story-of-compassion.html

Also read Dawn of everything and humankind for more sources and more then I could possibly give.

But simply put. You are incorrect