By: Addison Wylie Mercy Rule is merciless.  The film does feature a restrained Kirk Cameron aiming to be more tolerable than he’s ever been before, but I’m just trying to find the silver lining within this family film that’s been conceived by blind incompetence. Cameron is an actor devout to his personal beliefs, and has been known to carry those views through faith-based flicks.  I have to give credit where credit is due, and at…