Why are human lives being valued so much? Theres an oversupply of them, most dont even bring any benefits for the greater good, more so the opposite

So why exactly is it so bad when a few useless people die? Infact the overpopulation already IS a problem, for both the population itself and the environment

Is there really any argument that speaks against a selective homicide of the disabled, homosexuals, people from races that havent managed to progress further than mud-huts and other worthless people?

Not only would that solve overpopulation but if we would cannibalize their remains it would also solve world hunger, and due to the huge supply of meat this would bring with it, also save us from global warming, given that the biggest manmade problem regarding that is the gas from breeding livestock