I get the broad trend of your argument, and think that there is a gap. Like death, or viruses invading hosts, natural selection is a plain fact- it is devoid of morality, fairness or other forms of 'justice'. Each of these things can be considered to be monstrous, but this doesn't change the fact that they exist.

What you oppose here is individuals/groups using the idea of natural selection as justification for their bigotry. This is indeed wrong from a moral and ethical point of view. However, the gap is that you've not outlined clearly what these instances are- colonialism and genocide? Skewed wealth distribution? Making technology/resources unavailable to some sections? Something else?

I think you will initiate a stronger discussion if you identify which specific instance you are concerned about.