One person's positive discrimination is another person's negative discrimination. Negative discrimination is seen by those its applied to as punishment. In their mind punishing someone for something that they had no hand in is a terrible technique to engineer a society and usually only leads to a backlash.
Further, it's easy to model what society should look like and how it should act by reducing it to mathematical models, but human behavior is not strictly dominated by mathematics.
Further, it's easy to model what society should look like and how it should act by reducing it to mathematical models, but human behavior is not strictly dominated by mathematics.