Leader of the opposition literally saying "I'm not calling for the slaughter of white people.....yet" to the thunderous applause from his audience is most definitely a reason to be worried about the future.
Some people say this kind of populist stuff (and worse) on campus here too. I feel like some of the polarising optimisations in social media that have happened in the US etc spill over to here - but the stakes are much higher here.
Malema is not the leader of the opposition, his party has won less than 10% typically. The official opposition is the DA, which governs Cape Town and the Western Cape Province.