“Natural fallacy” people say that whatever way people were living for thousands of years is the happier way, because your body and mind is literally designed to live that way. The idea is there will be friction and thus disturbation if you stray off the default path. It’s more reasonable than the idea modern way of living is better. I see no justification for modern lifestyle. Still I don’t completely buy “natural” life because I believe men has a tendency to do evil which when mitigated by religion, leads to an even happier lifestyle than the indigenous tribe life (and yes, the primitive tribe people are happier than the average modern Joe.)