I imagine it's tough to hold onto your humanity in such a bleak and insane time. Almost everyone you know is dead (or undead) and you'll need to fight to survive every second of every day. And that callous nature is starting to become more and more transparent in a handful of survivors. The scene where Andrea retrieves an arm might seem pointless to some (or even just an attempt to add more gore), but I took it as a showcase of how they've become immune to such terrible things. Episodes earlier she would panic at the sight of a zombie, now she's casually riding in the back with a bunch of corpses and then picks up a severed arm like it's nothing out of the ordinary. Even Lori is afraid Carl is growing cold because he would have shot Sophia, too. Save them with your heart of gold, Rick!
