Humankind has undergone a dramatic shift over the past few centuries. A combination of industrialised farming and modern medicine has allowed us to completely overcome our biology. We exist in record populations, live for longer than ever, and, most crucially are able to survive a wide range of situations that would have previously killed us. We are a social species. We naturally collaborate and help each other, and don’t stand by while others suffer. As a result of this, we no longer live under the law of ‘survival of the fittest’ – we exist as ‘survival of everyone’.
Evolution needs two things in order to work: genetic variation and selective pressure. Genetic variation is inevitable. It will always exist amongst living populations. Even if you had a theoretical population of exact clones, variation would arise over generations due to DNA copying errors, recombination and genetic drift.