It burns that the repressive Nats regime of Vorster back in the 70s had the guts (morality??) to force Ian Smith (Rhodies I have met over the years hate Vorster and SA for that) to the negotiating table while our ANC from the start of their taking power in SA and onwards have done zero to hold Bob and his terrible repression to account. We have the power to effect a peaceful change but not the guts or morals? Perhaps Mugabe has something on the ANC that he treatens to use if pushed? Common assult is assult by anyone and the only way to settle it is via the courts, are we so worried about our courts not being up to it? 
PS - a senior Rhodesian officer serving at their army HQ advised me that because of SA sanctions they were down to 2/3 weeks ammunition, which forced Smith to cave in and the rest is history. See what tough quite diplomacy can do.