Dexter Morgan

Showtime's TV series "Dexter," whose sympathetic portrayal of a serial killer already plumbs the depths of depravity, managed to sink to a new low by adding blasphemy to its formula of grisly vigilante murder. Two promotional videos released by Showtime, previewing Season 6 of "Dexter," mingled sacred images with the show's recurring theme of vigilante murder. The first video (cynically…