Thomas Sowell is just right on more levels than I can write:

People who have already been out in the real world, practicing for years whatever their particular specialty might be, have some basis for determining which things are relevant enough to go into a curriculum to teach those who follow. The idea that students can determine relevance in advance is one of the many counterproductive notions to come out of the 1960s.

The fetish of "relevance" has been particularly destructive in the education of minority students at all levels. If the students do not see immediately how what they are studying applies to their lives in the ghetto, then it is supposed to be irrelevant.

How are these students ever going to get out of the poverty of the ghetto unless they learn to function in ways that are more economically productive? Even if they spend all their lives in the ghetto, if they are to spend them in such roles as doctors or engineers, then they are going to have to study things that are not peculiar ("relevant") to the ghetto.

Worst of all, those teachers who teach minority students things like math and science, whose relevance the students do not see, may encounter resistance and resentment, while those teachers who pander to minority students by turning their courses into rap sessions and ethnic navel-gazing exercises capture their interest and allegiance.

I'll stop there only to avoid copying over the entire article. Read it.