Dexter season 05 episode 1 Why did Dexter kill the man at the last dock shop?

This man is innocent (at least the clues given in the play show that he is innocent). Just like the photographer of sm, although guilty, he is not guilty to death. Dexter is also responsible for the death of Doakes in the second season (Dexter will not turn himself in, even if lila doesn't kill Doakes, D will do it himself or plant it on him). In fact, the whole play never mentioned that Dexter was innocent. Even if he just killed a poor and vicious person, or lied to someone who loved him with white intentions, he was guilty, and everyone around him suffered because of him (Rita, Harry, Debbie, three children, Lila and Hannah, etc. ), this is also the original intention of the screenwriter.