External and Internal

Putna, Kansa, Bakasur, Trnavarta, Aghaasur, Dhenuka, Pralambha are demons killed by Rama and Krishna.

Is Krishna slaying external demons or is he driving away and slaying the fears of his devotees? He is not slaying externally. he is slaying internally. his devotees don't even know they have such fears within them. And Krishna is slaying one fear after another, preparing his loved ones for a smooth journey into a place where people are fearless and therefore happy.
Anger actually comes from false pride and fear. When I consider myself the doer and I consider myself threatened, I get angry. But there is no threat to a devotee. A devotee has no false ego and no fear. He is surrendered, and so anger does not touch him.