I'm getting the sense that there's some underlying issues in paradise. Probably no different than any town without zombies running around.
I know it's probably unlikely (and I'm trying to stay away from any comic spoilers), but personally I'm hoping for once that there ISN'T some nefarious or hidden "secret" to the place at all. And that the main problem is just what was hinted at in this episode-- that it's populated by a bunch of weak, soft, or just plain stupid people who eventually start to turn on the newcomers because they feel judged or intimidated or for some other petty reason. And so they decide they want them all thrown out... which of course leads to Rick taking the place over.
That's what I was getting at, either way, we know there's gotta be some bumps somewhere, we ain't getting a happy ending yet.