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.

nationalgeographic.com/…/deformed-skull-of-prehis…

nytimes.com/…/ancient-bones-that-tell-a-story-of-…

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

But simply put. You are incorrect