I can see that. Let me add to my theory of why he is angry. When he was a little boy his parents entrusted him in the care of a local priest, monk or another individual at their church and he was repeatedly molested by them. He never told his parents because the trusted church person threatened to kill them and his family. The abuse of DR continues until he either says stop or is removed somehow from the situation or perp dies. This leaves a broken DR who has been molested by someone his parents trusted to take care of DR. He does not know anything about how to relate to another individual sexually except what he experienced as a child. It is what it is and he can't control his impulses. He fantasizes a lot and over the years has come up with detailed fantasies about what he would do if those neighbor boys came by his driveway at night. Boom, he just happens to be outside the very first night these boys are allowed out solo and his parents are away. He puts his plan into action, grabs Jacob, does whatever his fantasy includes and disposes of Jacob right before the 11:23 911 call and his visit down the driveway to speak to cops about what is going on. He does this to keep them from coming to his front door in a pro-active way and to not draw suspicion to him.
He stays living with his parents because he can't let go of that fear he had as a boy when the perp threatened to kill them. He is there to protect them and because he only feels safe at home.
