It absolutely does by offering 30 year fixed rate loans with no prepayment penalty and all the underwriting waivers for people to be able to pay more than they can afford, such as no money down and 5% down mortgages.
Just like home (land) prices in certain parts of the country.
But the prices in the overall market, just like “Wall Street” is backed (and juiced) by the federal government.
What we have is the result of decades of making owning a home the main way to accrue wealth and then giving homeowners outsized power.
Wall Street is just following the money.
Having said that, the major banks shouldn't have got bailed-out either. Smaller banks that were responsible would have had the opportunity to grow when the larger banks faltered due to their bad decisions.
As another commenter here quipped, the first houses Wall Street bought were in Congress.