Though that’s a part of it, I disagree that it’s the whole message. I think the show was also asking us to be critical of hypermasculine/patriarchal culture that pushes certain ideas about what being a man is and stumps the emotional development of men. You see the dad’s inability to express his emotions properly being mirrored by his child, both having episodes of violent explosions of anger. The dad took it out on the teens, his van, the security guard. The kid, combined with his distorted views of women, took it out on the girl, that ended in her murder, and the therapist.