It is unknown when Kookaka gained the ability to distinguish morality. It is only known that he can, and he's not the only one. Kookaka is the leader of the Dalek Resistance, an organisation of Daleks who've had enough of the Daleks' genocidal ways.
Creations of the mad scientist Davros of Skaro, the Daleks are considered one of the most powerful and fearsome races of the universe. The Daleks only just barely survived the Last Great Time War, but at a cost. There empire has been shattered, and they …