I think he's implying that the reason we haven't encountered other intelligent life (aliens) is because at a certain threshold of civilizational affluence/comfort, civilization naturally collapses due to low birth rates. The mouse utopia experiments provide credible evidence for this thesis, unfortunately. In this context, I believe he is accusing you of trying to stop a hurricane with a pinwheel. For what it's worth, though, I appreciate your comments on the subject, and do not find them futile.