Your point is very valid. Schooling begins at home with parents that promote learning as a priority. The breakdown of the family unit (especially in minority families) often make teaching difficult as best
Many kids don't see the need to learn or get a good job - they get free breakfast, lunch, dinner, rent, health care, etc., as well as an iPod. This attitude becomes contagious (it becomes a competition to see who can care the least or "get over" the most).
The work ethic is shot, and the idea of pride in everyday accomplishments is lost.
This is the very predictable result of affirmative action. You simply cannot enforce two separate standards on a group of people. The de facto standard will revert to the lower one.
Whoever thought a good way to integrate blacks into the workplace would be to hold them to lower standards than their eventual classmates and co-workers should be shot.