Nuer Genocidal Act against Anywaa

Nuer attacks against the Anywaa in refugee camps in Kenya in the last week without provocation. What does the Nuer want, and why does Anywaa allow the Nuer to take over Anywaaland, starting from South Sudan to Ethiopia, where the Nuer doesn’t have land? Why has Anywaa accepted Nuer's assertion as Gambelleans while they came as refugees? Why is the Ethiopian government so ignorant?