IMHO
Actually the black community rejects vouchers based on the idea that anything that is not perceived as strengthening the 'community' is seen as weakening it.
Vouchers would take black children out of the black community and integrate them into successful mainstream America. They see there strength in numbers, their communal bond to each other, brothers and sisters all.
If one was to go off and find success on their own, well... that just one less voice in the chorus, one less vote at the ballot box. They enslave themselves to a degree with this obsolete survival skill.
This same community/cultural defence mechanism is what drives the black community to demagog and label all successful blacks as "Uncle Tom's". Clarence Thomas, Colin Powell, Jesse Lee Peterson, the list is endless. Liberals on the otherhand, whether Charlatan or Dupe just go along with whatever the black community espouses right or wrong to get votes or suppress some coerced guilt complex respectively.
All in all, Liberals could care less about improving anything.
Eddie01
In one sentence, you have put your finger on the problem the liberals see with vouchers. I hadn't thought of it until now, it makes perfect sense.