There would be less people alive if it wasn't for Rick. He's been in charge since day one, and most of the group is glad that he is. It did seem a little harsh.. but like Rick had said, Carol is strong enough to make it now and I doubt some of the people would have taken to kindly to her if she had gone back. I'm sure she'll join up with some other people.
Something does seem off with that one little girl that is in quarantine though. At first I thought the girl might have had something to do with the two people being killed, and that Carol was helping to cover it up.