Since you know the name of this ‘Steven Biko’, I’m certain you also know the names of all those murdered by Mandela’s comrades, then and later, or else ask yourself how come one and not the other, and also who and why drilled the name ‘Steven Biko’ into your memory.
Peter Gabriel?
If they were key players on the respective sides, there's a good chance I do. Hendrik Verwoerd was assassinated in 1966 by a SA communist. Biko was a relatively significant player in the events of the day on the other side, so I think it's less surprising that I would recognize his name than it is that you might not. And again, I'm excusing nothing Mandela and ANC did, but the NP did what they did under the color of law. Biko was "banned" under South African law meaning he was restricted from traveling outside of certain areas, could not speak to more than one person at a time, and others could not quote or publish anything he said. He was arrested for violating this ban and then beaten to death in custody.
How about you ask yourself a question. Suppose the minority black population of the US became the predominant political power, and put onerous restrictions on the movements, and freedom of association of the majority whites and then shot up a few demonstrations against the policies (i.e. Sharpeville, 1960, Soweto, 1976, etc.)
Would you expect the white population of the US to suck it up, or would you expect at least some degree of violent backlash?
I think it was Bobby Sands.
Or maybe Mumia.