> What part are you referring to?

A lot of the program seems to have rested on subsidies and incentives, which are nice ways of saying you're relying on a profit or investment motive.

> Well, on the other hand, is there something inherent in housing that requires those motives?

Aside from that it requires scarce resources to produce and maintain and is rival in nature? I suppose not. Though that does put it in the company of quite a few other goods and services.