I have a pretty rudimentary understanding of science and never studied it more than a high school level, but I have been thinking about Covid and is it related to evolution. The virus doesn't actually seem to be killing people who are reasonably healthy and are relatively young. Anyone I personally know that has had it had basically a cold or flu for a week, then they were fine. The people who are most at risk seem to be extremely old or are morbidly obese (also outliers like people with asthma/ just put that to the side for a second). Covid aside is it not already concerning as a species that we have huge numbers of people that are dangerously overweight or obese. Also that in developing countries there is a growing aging population that is gradually consuming more and more resources (pensions) that is taking from other groups in society. I remember once watching a wildlife program where an old lion (I might be getting the animal wrong, feel free to correct me) was killed by the rest of it's pack because it was dragging them all down to the lowest common denominator. They keep trying to stigmatise the term herd immunity. I accept I could be completely wrong about this and I'm completely ignorant about science. Basically is the only way herd immunity can be achieved is if the virus basically kills off the population who are too weak to fight it? Also is the virus in a sense nature's way of correcting human evolution?