^ Indeed. Not to mention Carol points out Axl and Oscar weren't like Tomas. Rick responds: "Yeah, and where's Oscar now?"
Um, Rick? He's dead alright - giving his life for the group. I'd say he proved himself pretty damn well as being trustworthy.
Exactly, Rick said he couldn't be responsible. I think that Rick is no longer denying people entry into the group because he doesn't trust them, he's doing it because he blames himself for every death and doesn't want to be responsible for any more.