The myth is that if housing prices go up, Americans will be richer. What banks - and behind them, the Federal Reserve - really want is for new buyers to be able to borrow enough money to buy the houses from mortgage defaulters, and thus save the banks from suffering from more mortgage defaults.
The problems of 2008 were never cured. The Federal Reserve's solution to the crisis was to lend the economy enough money to borrow its way out of debt. It thought that if it could subsidize banks lending homeowners enough money to buy houses from people who are defaulting, then the bank balance sheets would end up okay.
Today, people are having to spend so much of their money, to acquire a house and to get an education that they don't have enough to spend on goods and services, except by running into yet more debt on their credit cards and other borrowings.
Just like a house is worth whatever a bank's going to lend against it, an education is worth whatever the bank is going to lend the student to pay the university. So the availability of government-guaranteed student loans has vastly inflated the cost of education, just like it's inflated the cost of housing.
The aim of promoting low down payments is to push prices back up so that fewer houses are going to be in negative equity and fewer people are going to walk away from the mortgages. That will save the from taking a loss on their junk mortgage loans.
