I have sufficient faith in the average black South African voter to believe that they would not have been befuddled by a clear stand: "Colonialism was bad but it had SOME good results." Our Parliamentary system, the Judicial system. Do the many urban black South Africans wish to return to the rule of tribal chief who believe they have power on internment, and execution. Proprietary rights to the land? I don't think so.
The fact is that amongst many others, Mandela himself thought so and expressed himself internationally.
And the DA is not going to win over the EFF.