FYI, Julius Malema is the leader of a tiny minority, radical party. His views do not represent the majority of the population whatsoever, and there are just as many white people belonging to racist, radical parties that want apartheid back.
And for some context, which seems lacking from your research, the song "Kill the Farmer, Kill the Boer" was a struggle song from Aprtheid, when racist white people literally killed black people in the street for no reason.
Yes, the lyrics are hectic, but understanding where they originated is helpful.