What paradox does the author describe in "My Dungeon Shook"?

The author writes of a paradox involving education and success. "I said that it was intended that you should perish in the ghetto, perish by never being allowed to go behind the white man's definitions, by never being allowed to spell your proper name. You have, and many of us have, defeated this intention; and by a terrible law, a terrible paradox, those innocents who believed that your imprisonment made them safe are losing their grasp of reality."