Self-defence is no offence. If you're attacked in the street i'm not going to moralise with you about which tactic you use to defend yourself!
There's not much talk about the violence of Apartheid from those criticising Mandela's stance.
To be clear, the minority of young ANC members who formed Umkhonto we Sizwe (MK: ‘Spear of the Nation’) of which Nelson was one, were on a
hiding to nothing. Terrorism is the last desperate defiant act of the defeated, In this case borne out of the frustration of demands for simple democracy being met with extreme violence and mass murder.from the state. MK were quickly arrested and imprisoned, along with the ANC leadership.
It was the wave of Mass struggle of the 70's, the 'New Union Movement' in '73, the student & community revolts in Soweto and the other Townships,leading to the Mass struggles and strikes of the 80's, for which Mandela became the figurehead from his cell, that finally forced the regime to negotiate with the ANC.