The issue about farm killings is extremely complex. On the one hand you can understand the anger towards the white farmer, but on the other hand more murder and dispossession is not the answer to murder and dispossession: https://www.accord.org.za/ajcr-issues/farm-attacks-or-white-.... Either way, it's real and Malema is encouraging it.
Malema is extremely separatist and xenophobic, or racist if you use the modern definition of the term. "Kill the boer" is definitely fighting words, and "western" commentators do not have the lived experience to add valuable perspective to the issue. The race situation in America is not the same as the race situation in South Africa (the race situation is all over the spectrum in Africa, let alone inconsistent with western problems).