Neither did Nelson Mandela, if that's what you're implying. To wit, the Church Street bombing (which is presumably what you're referring to by the Pretoria car

Neither did Nelson Mandela, if that's what you're implying. To wit, the Church Street bombing (which is presumably what you're referring to by the Pretoria car bomb) by the MK happened in 1983. That's 20 years after Mandela was imprisoned. Unless you have some credible evidence that he was somehow the kingpin behind all the violent activities of the ANC and/or MK during the time that he was in prison, I think it's fair to say you're wrong.