This is typical African tribal hatreds of long standing.
Nothing to see here.
The author neglects to mention that the real troublemakers are the Muslims in North Sudan, who have been trying to conquer the Africans in South Soudan for more than a century.
The UN, naturally, sides with the Muslims, and lies its head off.
I’m not saying that the current government of South Sudan is perfect. But nothing could be worse than Islam.