Episode 8 is indeed the most confusing episode in this series. There seems to be mostly nothing done to the murderer. No matter what the show, that's a horribly wrong message to convey.
I understand that they wanted this series to be a more "adult" series that requires deep thinking, but really, there's so much wrong in that episode. Deep thinking doesn't mean you have to show it's okay to let go someone who murdered people and beat up a defenseless person to near death just because the murderer is a human.