On Prejudice

As the lie is necessary to define the truth, Lucifer exists to illuminate the good. Just so, the authoritarian (adherent to false authority) has demonstrated what democracy is about.
Compare and contrast. These are basic processes which, it seems, concrete thinkers are not capable of. They like and do not like without any apparent reason. So, we call them prejudiced. But, does that mean their attitudes are formed before the ability to judge develops (about age 7) or their attitudes are preemptive and not informed by experience at all?