Mitchell is willing to make a deal about the food if he gets his way with Jake. Jake and Emily do their part to save the town. As the town survival's depends on staying pulled together we can see that fractures are developing among the townspeople as represented by Gray. He was in it for himself period. The character is going to prove to be bad I think for the town.
It's not unusual for the town to begin to fall apart in a post nuclear world. But it's time for the writers to start dealing with basic issues as well as the major ones.