I think the main theme is that they will have to move to the camp, because the soil and ecosphere of the environment is contaminated on account of all the zombies dying.
The worms poison the pigs, the pigs poison the people and now the people die and eat each other. So be nice to your ecosphere.
I was just really happy Rick didn't have to look after all these new people that were eaten at the outset of the show. Also, when he decided to use his guns again.
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