Tracker, I think it makes more sense within the context of the show that they've lived in a "zombie "less world prior to what's happening to them. I think this is pretty standard in most zombie films, minus the tongue in cheek ones like Shaun and Zombieland.
As for killing off Dale because he's uninteresting... Give it time. I thought the same previously about Shane, Andrea and the boy... But all three have comes around and developed this past season. Characters will come and go, but they shouldn't at the sake of who we fans think is interesting. Sit back and see how things happen.
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