I won't kill that slimeball or any of his ragtag group of survivors. I won't bloody my hands on such filth. However....one thing i will do(if given the opportunity) is make him suffer. Likely no physical punishment, but mental and emotional.
Perhaps something like constantly forcing him to stand outside amidst a batch of walkers and killing those who get close(but only immediately before they bite him). I'd make him suffer like we did, to feel the dread and tragedy we were forced to endure all because of his own selfish greed.
As Kenny said....I'll make him wish the cancer got him.
I have your number, Vernon. Your time will come.
On the other hand maybe it's best if he doesn't appear in season 2, so i don't become a psychopath.