So it's things like: some people died because there was a famine and they didn't have lactose tolerance (and thus didn't have any cows, or they'd just eat the cows, a detail). Some people died due to having unnecessarily large and sturdy jaws in the era of cooked food. (Not sure how this would cause death, perhaps due to greater surface area for tooth trouble? It's always the teeth.) Then, their offspring - wait, I mean other people's offspring - are more adapted and less vulnerable.

Well sure, we should become less vulnerable, including biologically. But there are better ways to accomplish this than having people killed.