I think that the Other Person's post was certainly well thought out and definitely had its points, but completely left out one factor - taking responsibility for your actions. Yes, Atlantis set Michael on his path by their morally questionable experimenting (and I'm with you, that storyline has always made me a bit queasy), but once he escaped his actions were his own. Was he treated poorly? Oh, yeah. Did Atlantis force him to become a mass murderer to rival Hitler and his cronies. Definitely not. He made that decision and Atlantis' treatment of him after that, I think, was justifiable.

As for Teyla dropping to Michael's level by executing him? In no way is her action comparable to Michael's mass murdering habits. She made a tough decision that will save untold lives by ending the one, he made a decision to punish the few by killing tens of thousands. Some might insist that imprisoning him would be the better idea, but I don't see that as a viable option in Atlantis even if I agreed with the concept. Prison is supposed to be for punishment and rehabilitation and I've never heard of a psychopath being rehabbed.

I'm surprised that I haven't seen any posts (yet) comparing Teyla's actions in Prodigal to Sheppard's in Miller's Crossing, which certainly caused some lively posting.