Don't be obtuse. The entire situation is implausible. My argument is that in this particular set of circumstances, I don't think that the devolution is society is all that unrealistic. And nor does anyone else who's ever written a post-apocalyptic story, where the complete breakdown of society is a given. I have no interest in debating this further with you, since I don't see any flexibility of thought processes with which to work with. Especially since you consider 15 years "a short amount of time".