The Church st Pretoria bombing was in direct response to murders that the SA government committed.
It was in response to a South African cross-border raid into Lesotho in December 1982 which killed 42 ANC supporters and civilians, and the assassination of Ruth First, an ANC activist and wife of Joe Slovo, in Maputo, Mozambique.
I'm presuming you feel it was ok for the South African apartheid government to kill innocent people on a daily basis, but the ANC were not allowed to respond?
Apartheid caused the whole situation,a cruel and injustice way of treating human beings.
When people are backed into a corner they will respond in any way possible.
That's what happened to the coloured people of SA.
Imagine if the Germans had invaded us in the 40's. Do you think our people would have just accepted it, or fought back with any means possible.