Yes, so to some extent Damian is an avatar of the Lord of Chaos and I think the Doctor should show more respect for him
Let me give you a metaphor : imagine leader of black supremacy movement, whom is himself a white, use this movement to increase his personal power and don't really cares about blacks (*demons were servants to human black ringers in Divinity 2 TDS). Not only that, but the leader is actually killed one of prominent black semi-leaders (*archdemon Samael) for his personal gain. Also, his competency is questioned when most of the time he's vaining and whine about his lost lover.
