‘The End of Tom Six’ Review: The Director of the ‘Human Centipede’ Films Has Multiple Sclerosis and Is Sharing the Horror. This Confessional Doc Is His Witty Self-Defense

"The End of Tom Six" is a self-styled confessional memoir in which Six fuses his life and career and illness into a parable. He’s asking: Is there room anymore for movies, like his, that stray over the line? And if not, what does that mean?