Not representative

Republicans like to showcase blacks who are Republicans and have succeeded through hard work. Those blacks are not representative of the vast majority of blacks in the US. It is typical of repressive regimes to try to make themselves acceptable to the majority by pointing out the support of a few members of a specific population. It would be like the following:

Jews for Hitler

Ethiopians for Mussolini

Koreans for Hirohito

Kulaks for Stalin

Cambodians for Pol Pot

Educated Chinese for Mao

Gays for Idi Amin

There will always be some members of a group who will support their oppressors.