Mathematicians and politicians have one thing in common: they both thrive on oversimplifying aspects of the real world. If there is one thing that a college education should teach every student it is that there are two sides to every question, that the world is not simple, that good and bad are not reducible to checking who is wearing a white hat, who a black. Mathematical models are based on isolating some effects, some aspects of a very complex real world situation and modeling this simplification. Political rhetoric is pretty much the same. The sad thing is that not only left and right wing activists vastly oversimplify the challenges our society faces but that now radical students at elite universities are so carried away by partial insight that they lose sight of the ideals of an open society. In this short post, I want to wade into two heavy duty issues that are often over-simplified: slavery vs. human rights and eugenics, the discussion of which provokes the strongest emotions. They are related as both have been supported by racism, justifying the enslavement of another race and regarding any people of mixed blood as equally inferior.