The motte: "There is great demand for dense, walkable, affordable, towns/cities/neighborhoods in the US, and not enough supply to satisfy this demand. A big reason why there is a supply shortage, aside from the relative inelasticity of housing in general, is government restrictions on building/zoning these sorts of developments. There are many coordination failures in attempts to create these sorts of neighborhoods which could be rectified through government action."
The bailey: "Suburbs are a failure of city planning. Car ownership/usage is a net negative on society and should be disincentivized. Government policy should work to eliminate suburbs, replacing them with dense development. Most of those who live in suburbs would surely choose and be happier living in denser developments."