As a person who would do what the girl did, I can really see that point of view. Someone who came to the store for fucking beer is a dead man, why not take a dead man's bicycle? Obviously it weighs on the conscience, but survival is survival. I like the MC a lot though, he's got the mental fortitude that no one else has to stay positive and enjoy life in a dark time, and if anything, he's more likely to survive than the girl. Morale is everything.