The apartheid regime might have justified extreme measures that killed civilians, but his hands are not as clean as you would imagine from the hagiography.
We don't glorify Gerry Adams in this way and give him Nobel prizes, although he did contribute a lot to the peace process in Ireland.
The "peace process" basically consisted of SF/IRA giving up and accepting the political arrangement which they had been violently opposing for decades, in exchange for goodies for themselves. As such it's a bit much to laud Adams for his role in it, beyond noting his success in persuading his fellow desperadoes to accept the goodies instead of continuing their deeply beloved war. (Though it turns out his success at this was pretty partial too.) Nonetheless if you don't think Adams has been glorified you're quite mistaken. As soon as the "peace process" began Adams (and Martin McGuinness, the Tweedledum to his Tweedledee) were the beneficiaries of an almost full-spectrum political and media bulldozing campaign in the Republic of Ireland, the UK and worldwide in support of the peace process and its heroes and against any hard questions. You wouldn't believe some of the soft-focused fawning and cooing Adams has received from mainstream sources, if you somehow haven't seen it yourself already.
So he didn't turn out to be a meek cow...that is your complaint?
While Ghandi lived in South Africa, he wrote racist slander towards black (African) people, referring to them as 'kaffirs' (the N word equivalent in SA). Here's a quote:
"Ours is one continued struggle against degradation sought to be inflicted upon us by the European, who desire to degrade us to the level of the raw Kaffir, whose occupation is hunting and whose sole ambition is to collect a certain number of cattle to buy a wife with, and then pass his life in indolence and nakedness."
Ghandi too was not perfect, and also experienced Apartheid (most notably when he was kicked off a train in Pietermaritzburg), and demonstrated against it in SA. Though I do not think he believed in equality for Indians with Blacks.
He writes about the experience in Pietermaritzburg and how it took this experience to realize that all men are brothers and deserving of equality. This is not to say the guy was a saint, but to mention that I believe he came around.