Nelson Mandela was a Communist who would not renounce violence. After the Left emerged victorious in South Africa the cameras wondered off to another crusade. Meanwhile , in the now Communist South Africa, White Farmers have been murdered by the hundreds, electricity is often off, and the nation has become a basket case.
On the other hand, most USA Blacks, and the Political Left, consider Mandela to be a secular Archangel, which is why they go bananas when Trump invokes his name.
Also, Rush Limbaugh used to do a drop dead perfect vocal imitation of Mandela, usually for completely silly things, which would always cause the Left to erupt in anger, decades ago.