I know this is from a couple episodes back now ("Clear") and has already been discussed then, but I keep dwelling on this more than any other moment from the season so far. Rick and Michonne (and Carl) drove by the Hitchhiker/Backpack Guy without so much as a comment, nevermind a discussion. A lot of people mentioned how this shows how the group has 'hardened' from their experiences but I disagree. It shows how those particular three characters have.
Does anyone really think that would have played out exactly the same if another member of the group, if Hershel, or even Daryl, were present? In those particular examples, in "Home" Daryl risked himself to help two armed strangers who were in imminent danger from walkers (I don't think he became aware of the mother and baby until he was upon the bridge). That was a far greater risk than the hitchhiker in my opinion. From "Arrow On The Doorpost", we see Hershel willing to strike up a conversation with a guy who he's fully aware is part of a hostile group, responsible for killing a member and the abuse of his own daughter. You're telling me they wouldn't have at least pulled over, told the guy to keep his distance, and then feel him out for information/potential skills/anything? Wouldn't just another warm body who can pull a trigger be beneficial right now? That guy would have done anything you needed in that situation. There won't be an easier situation to add someone to the group than that.
I think this is important right now because people are speculating on the potential of other characters (both TV and Comic) of joining the group later on in the show. If the appointed leader automatically views anyone and everyone as a threat, how's that going to happen? Either Rick needs to simmer down his Paranoia or someone else has to start calling the some shots.