Hitman (2007)

''How does a good man decide when to kill?'' asks Timothy Olyphant's killer-for-hire protagonist in the opening minutes of Hitman. But we have a better question for you, Timothy Olyphant: ''How does such a good actor wind up in this witless piece of action schlock?'' Based on a videogame, Hitman could be the year's dumbest movie, thanks to an idiotic premise concerning a group of secretive assassins identifiable only — only? — by the large bar-code tattoos on the backs of their shaved noggins. D