Wouldn't it have been wonderful if only the writers had allowed for Carl and Pansy to return to Atlantic City, marry, then opened a taffy sweet shop sending the occasional prank taffy box to Edward for his amusement!
I'd like to think Charity remained possessed by Pansy, and that eventually, Carl would come back to her by inhabiting someone else's body. I had planned on writing a fanfic about that, but never got around to it.
Please. Barnabas Collins left enough corpses lying around to suggest the Black Death had arrived in Collinsport. The fact that he hesitated to slaughter his relatives with the same abandon as he did other folk does not assuage his guilt nor diminish his responsibility. The death of Carl Collins was lazy writing, in my opinion, and a pretty lousy way to let John Karlen go do something else.
Still, it shows Barnabas's completely independent sense of right and wrong, that had little or nothing to do with society's standards, for better or worse, no matter how "good" he became. He was judge jury and executioner and never deviated from this. I don't think we ever saw him stopping to think about the morality of this, which is part of what made the character interesting.