I’ll grant you that for the first 2000 years of man’s existence he was so violent to each other that he eventually caused his Creator to nearly wipe him out.
But 90,000 years to figure out how to protect from predators? Nah, not buying it.
wolves the size of grizzlies, the short-faced bear that was even larger, various predatory cats and the fact that any minor injury could turn fatal from infection. the infant mortality rate would have been very high.