@Sandor i REALLY hope you were joking and it totally flew over my head....but if not:
He is neither a traitor nor barbaric. He was raised by the monsters/spirits of that forest since he was a baby. They are his family and that forest is his home.
You try to harm his family, he attacks you LIKE ANY HUMAN WOULD.
You try to damage his home, he attacks you LIKE ANY HUMAN WOULD.
If a monster entered the house of a human family and started looting stuff, how do you think they would react? Kill the monster without a second thought, without giving a f**k if the monster knew it was their home. AND HE DOES EXACTLY THE SAME.
He is acting like every human MC or human adventurer we read about in fantasy mangas. The only difference is that this time the MC is ON THE SIDE OF THE MONSTERS.
We are reading a fantasy manga from the POV of the sentient monsters, and he is acting accordingly.