The religious and mythological layers and parallels in this episode were stunning. The prison, a type of Greek heaven separate from the other world of the afterlife, Hades, represents just that kind of heaven we find in this episode--where life is easiest for people behind the prison walls. The govenors "clan" was relegated to a hellish life on the run at best. This fits completely with Greek mythology and ancient Greek beliefs. The tank itself could be seen as a modern day trojan horse that allows the govenors clan access to the prison, or Troy if you will.
But that's just the Greek angle. Then you have Rick, explaining to the govenor how he believes everyone can forgive each other and live together in peace. Remember, Jesus forgave those who persecuted him before the end. The parallel is clear, and his mental journey is also clear throughout the episode. It isn't just one moment of cheap payoff in the end.
I could type more on the subject, but I suspect my sarcasm has run out.