[crististm]

What is the problem with hiring a white person vs a blue person if the white one is better? And vice-versa, hiring the blue one if he is better?

If you want to hire white workers regardless of their competence, then you should start a company.

"Better" means that they have a high probability of doing the job as the employers sees fit. Don't go nitpicking on defining 'better'. If you do, you're not suited for the job of deciding who to hire.

And if you are suggesting that hiring process is biased then you are right - people are not robots.