I agree with you there, but that is just a piece of the oppression pie. That alone will not stop blacks from being oppressed. And many of the programs intended to help poor blacks (welfare, affirmative action, etc.) actually have the opposite effect.
If you compared starvation rates before and after welfare, it's hard to argue that it made things worse. If you argue employment rates before and after affirmative action, it's again hard to argue it made things worse. Reducing the number of criminal convictions will improve many things, starting with employment.