Nus Braka was part and parcel of the entire theme of the season. He was Caleb Mir's counterpoint. Both Nus and Caleb had rough lives and essentially had to fare for themselves as children. However, Caleb had a loving relationship with a mother who loved and protected him and created a moral center, even if he had to find that center again. Whereas, Nus was raised by a hateful man who beat him, taught him to exploit others and eventually allowed his hate to destroy him.
As Ake said, "children are our ambassadors to the future". How we treat our younger generation informs how they will treat us and see the world in return.