‘Dexter’ and the Exhibits That Wouldn’t Die

The very first thing to die in “Dexter: New Blood” is irony. The homicide weapon is the subtitle. Oh, there’s blood, all proper. That’s what Showtime’s righteous-serial-killer franchise promised from 2006 to 2013, and we get it within the very first episode of this revival, in snow-staining buckets. What we don’t get, within the 4