It doesn't matter if you use half as much energy per capita if the thing you created results in 50x more people. When I say destroy the cities I mean to include the populations in them. Through policy you make their lives so miserable that they are not replaced generationally. A similar thing was done to rural areas, their people were systematically destroyed through policy.
Most of the people on HN seem to be city-dwelling pro centralization and centralized control. It seems to be jarring for them to see their own policies of openly promoting the destruction of others lives and way of living directed back at them.