I dont hate Kahak, i pity him.
This boy, and all his antecessors, are victims of the will of a crazy woman that mistaken obsession with love and allied herself with a "thing" that she and no one truly comprehends, the only way for him to find peace is to forget Fushi but i admit that this now isnt really feasible as he is still or was an important fighting force.
About Bon, i disagree with him at certain points, but i think what he chose to do was a good option, not the best or the only option but still good. He truly cares for Fushi, the thing is that the challenge of the Knockers is much higher than it was first thought