> And how exactly does capitalism do it? That is, who tells certain people
> that they should drop out of school, put baggy clothes on, start listening
> to (c)rap musing and doing drugs, and what does he do to enforce it?
Capitalism is a class-war system, so it must and will replicate class differences or it will go out of business. I don't think the particular techniques matter much (although they're sometimes interestingly ingenious); they will change with changing conditions.
> happens to those people who do not want to go with the (capitalist) program
> and go to college and apply for office or academic jobs?
If you have enough of them, you have a situation in which PhDs are working on garbage trucks for the minimum wage. The lesson will not be lost on even the most casual observer.