3V0,
Since you brought it up, yes, I can find a flaw with your logic...
Them that can, do.
Them that can't, teach.
Them that can't teach, administrate.
Them that can't teach or administrate eventually get elected to political office.
Them that can't and won't, vote and are rewarded.
PS, I mean no offense to some great teachers we have in the world. It's just that to a great degree, the educational system is failing our students and we cannot seem to turn out enough well-educated students. By the time students get to their senior project to earn their degree, its too late to learn how to learn.