…This also means that the two stated pillars of American housing policy—homeownership as wealth-building and housing affordability—are fundamentally at odds. Mostly, American housing policy resolves this contradiction by quietly deciding that it really doesn’t care that much about affordability after all. While funds for low-income subsidized housing languish, much larger pots of money are set aside for promoting homeownership through subsidies like the mortgage interest deduction and capital gains exemption, most of which goes to upper-middle- or upper-class households.
Source: Housing Can’t Be Both Affordable and a Good Investment