Some great answers above. I had forgotten about Dr. Corman (another Dr., albeit a dentist). He was willing to destroy a whole family just so he could keep up the freeloading good life for a while longer. Regarding Emmitt Clayton, I agree that his act was particularly heinous because Dudek was such a lovable guy and wiling to be a good friend.
On the other end of the spectrum, I would pardon Faye Dunaway for what I felt was justifiable homicide to protect her daughter. What choice did she have?
Everybody hated that creep!
Is "Victims who had it coming" an actual thread? If not, it would be a good one.
That's nearly my only complaint about this site. I wish it were the kind where the latest thread to be added to becomes the top one on the page.
Columbo (Bert Freed) took out quite a few as Schmidt the hangman, in Hang Em High