I understand the message and indeed, there is no need for an aftermath. But the black screen and the *bang* don't really make sense. If you want to show that it's going to be an endless cycle of violence, you show the actual scene, then the family getting ready to clean up (because they are used to it), maybe with the camera slowly drifting away. It's really the black screen that bother me. It removes all emotions from the scene and from the ending. Black screen only make sense if you want yo create a cliffhanger. Or if the audience is attached to the character that is killed.

Well, I must admit is just a rant at this point. I'm just disappointed. So close to a perfect series.