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ChrisToohey said: One of the things that I like about The Walking Dead is that you're not following the scientists and others in-the-know with regard to the cause and science behind the zombie apocalypse. Instead, you're following a melting pot of survivors that are just trying to make it to another day.
Rick says at the end of Season 2 that he didn't believe Jenner outright, and didn't know until he saw the non-bitten, non-scratched zombified guards. This speaks to their "we're learning as we go" methodology.
And I do believe that The Walking Dead takes place in a world that didn't know of the Romero films/zombie genre. Of course WE know the rules of the genre, but these poor bastards are picking up intel as they go.
As for Lori, I suspect that Rick is more upset that he allowed himself to be manipulated by Lori vs. anything else. The pending arrival of the baby is a constant reminder of the absence of Shane, and that he was manipulated into killing his best friend by the love of his life. You can see how this has affected Rick in how he dealt with Tomas. Would Season 1 Rick have done that? Hell, Season 2 Rick wouldn't have done that (and only shot-up the bar when directly threatened). It's the post-Death of Shane-Rick that's understanding how to survive this new world and his role within it: I have the mantle of leadership thrust upon me, lives of those I love in my hands, and it is up to me to ensure that every decision and every action positively affects those around me... and nothing - especially my own morals - can stand in the way.
You can see the last of that morality slipping away with his attempt to communicate his reluctance to kill the living with Lori. Lori tells him that he can do it with a clear conscience, knowing that it's the best for the group. I also suspect that his reaction to closing the yard door (trying to be as spoiler-free here as possible) was more of his "... what am I doing?!" All of this combined, you can completely understand his detachment from Lori. Hell, I'm certain he blames her more for what he's becoming than the Shane/baby thing. And while I don't totally agree with that logic, it's logic coming from a character... Remember, in his mind, that whole mess ended during the fight with Shane at the municipal building... until Shane freed the prisoner. So while I'm certain there's lingering pain and frustration, the Rick character seems more at a loss for the man that he was (husband, father, and man of the law and morality). I'm certain that if you dropped Season 3 Rick into the "Vatos" situation, things would have ended much differently... and there's something to be said for that all things considered. We saw Shane slip further and further into the character that he became, and I'm certain that Rick is more than aware of his similar slide into the gray.
OK, enough babbling from me...