Government mandated racist employment policies have been a monumental failure.
At some level I believe even the most brainwashed know this and understand the result, yet they continue to choose to have broken institutions, mass inefficiency and a decaying economy instead of freeing up SOE's, government departments and the business sector to use the best people available, no matter their skin colour.
I've thought long and hard about this and sadly my only conclusion is that it comes down to racism and revenge. There is no other logical explanation for deliberately shooting yourself in the foot for the sake of excluding one minority ethnic group.
I believe that there are many in positions of power who are well aware of the damage it does, but unfortunately, it is now politically impossible for this to be reversed under the current hegemony, and it is virtual political suicide to speak out against it.
History shows that an impasse like this is only resolved during a massive catharsis of some kind - war, famine, disaster, economic collapse, etc.