“It Happens. So it’s Part of What We Are.” Said Robinson Devor on behalf of his new film about bestiality inflicted by men upon horses. Now, I’ve heard every miserable and pathetic excuse in the book. We have successfully defined deviancy down to the bedrock and don’t have a sharp enough drill bit to sink it any lower. Daniel Patrick Moynihan would turn over in his grave, but not if Robinson Devor, the director of the movie “Zoo,” were anywhere near his final resting place. Devor’s decent into the depths of human depravity was unveiled at this year’s Sundance Film...