I just came to a realization about the gun touch: it has nothing to do with Pete. Rick is carrying a visible sidearm. If that was a 'must kill' or 'must cop' reflex his hand would have gone to the peacemaker. Instead, it's got to be a direct response to the A flash, "you're one of us now!" He touches the hidden gun 8 inches away from the visible one...no I am not. Not really. Maybe that's a guilty touch, like when he hesitates to take it from Carol for a moment. He's breaking the ASZhat's trust by having it. Instead of a scarlet letter burning on his hand, he has a pistol burning under his jacket. Or maybe it's a reaffirmation, I haven't drunk the kool-aid.
Which also puts a spin on the "I love you wall" scene right after. He's happy to hear the zombie because that's the justification for breaking trust. There is danger, as peaceful as this place looks, there's still zombies out there, and still the same potential problems in here.