Topflight guest stars like Keith Carradine, John Lithgow and Jimmy Smits fueled excellent season-long arcs.But when Dexter moped in the finale that his life had been a trail of blood and body parts" and branded as a foolish dream the notion of a happy life, the series, like Dexter, surrendered without cause.For so long, all I wanted was to be like other people, to feel what they felt, Dexter