-US genociding blacks.
Hey, look at the media and you'll find this one is plausible!
But yea, the white farmers thing was a bad example. That's more dereliction of care. I suppose the main thing you can say about the group is that it was based around the extermination of the Apartheid, and very often this type of thing can go on to being about the extermination of an ethnicity. As their "traditional funeral song" indicates.
Hitler did all of that evil stuff, saw it didn't work well, and went into politics. Gerry Adams did the same. It's a trend.
Doesn't make him a changed man, just one with the same agenda but a different method.
Uhm, wait, what did Mandela do when he was a politician that earns him a Hitler comparison? Having a quick glance at Wikipedia reveals no attempt at killing people, campaigning against whites or even retaliating against the old regime after he left the prison.
Hitler was seen as a saint for giving bread and jobs, and for fighting the Treaty of Versailles. Likewise Mandela was seen as a saint, despite his history in attacks on civilians. Hitler went to jail, Mandela went to jail. Hitler came out of jail and changed his tactics to the political side of things, as did Mandela. Both got power they didn't through their terrorist organisations.
The only difference is that Hitler didn't play it safe - he went on all out massacre. Mandela didn't, perhaps learning from Idi Amin's, the Ugandan, example. Mandela was no where near as bad as Idi Amin - he went fully genocidal, and it got him the chop- politically speaking. Physically, he got the kidney chop. So I'd say Mandela put on a good public face, but after committing hundreds of crimes, I doubt your thoughts will be changed for the good by being incarcerated.
Of course, as Arx says, I haven't been to South Africa. I do think the media definitely rose tinged Mandela, but opinions on the extent to which that is true will vary.