That's quite a big assumption, but what do you think will happen if you don't offer them any education? They won't earn much or grow the economy and might end up going to prison, which is far more expensive.
Assuming such a group exists, the point is that if you do offer them an education (or, rather, try to force it upon them), they won't accept it, so they still won't earn much or grow the economy and might end up going to prison, but now their peers don't get an education either and suffer the same fate.