The thought being it's okay to steal from married households because they intentionally set themselves up for lower per partner overhead? Why don't we charge single taxpayers with roommates on the same schedule?

By living in a single house, a married couple demands less housing, which reduces the cost of housing against a fixed supply. Why are we taxing the people making housing cheaper under the guise of "affordable housing"? Shouldn't we treat affordable housing taxes like the carpool lane and reduce the burden of those that are reducing the burden on the constrained supply?