Actually, contrary to what they thought, the Hairdresser was not as angry as he seemed.
Although at the very beginning, there indeed were feelings of sorrow, helplessness, and anger that burst forth from the depths of his heart.
But with the Hairdresser's self-control, it was actually quite easy for him to suppress them.
The reason he went with the flow and used the anger to ignite flames, even going as far as to adopt behaviors similar to those of Tovatus... was actually to increase the "godfather's" intimidation factor.
He took drastic action all at once, ensuring that such incidents would not reoccur. This was not only for his own safety but also for the Codeless who might be used by others as pawns to test him.
But that deliberately portrayed facade of cruelty and brutality...
... still caused him to experience an unexpectedly intense and liberating sense of pleasure when he burned a man alive using a spell, harmed others physically, and took control of their fate.
