Living in a state where more tax dollars get spent on the prison system over education, I am a huge believer in Capital Punishment, so Dexter's method of killing serial killers who slipped through the cracks made it very easy for me to root for him.
That lifestyle will lead to a casualty or two; that's understandable and even to an extent, forgivable (especially when the two main casualties were lonely, miserable fucks). However, choosing his "urge" to kill over the safety of his family at times, that's where you really have to shake your head at Dexter and why the ending would have been perfect if the show actually got there in a more reasonable and exciting way.
That lifestyle will lead to a casualty or two; that's understandable and even to an extent, forgivable (especially when the two main casualties were lonely, miserable fucks). However, choosing his "urge" to kill over the safety of his family at times, that's where you really have to shake your head at Dexter and why the ending would have been perfect if the show actually got there in a more reasonable and exciting way.