You're missing the point. It's just hand-wavy set of statements thinly veiled as an explanation for the lack of aliens, which is really nothing more than another cliche railing against consumerism and how society is just so bad. You could just replace whatever cause celeb that you'd like but that doesn't mean there is any real merit to it. Even if the aliens wiped themselves out with Farmville, Lays, or thermonuclear weapons; it seems unlikely they would go straight to the Zynga deathcamps without any exploration etc in between.