Here you go, some reading to open your eyes.
The Government-Created Subprime Mortgage Meltdown by Thomas DiLorenzoThe thousands of mortgage defaults and foreclosures in the "subprime" housing market (i.e., mortgage holders with poor credit ratings) is the direct result of thirty years of government policy that has forced banks to make bad loans to un-creditworthy borrowers. The policy in question is the 1977 Community Reinvestment Act (CRA), which compels banks to make loans to low-income borrowers and in what the supporters of the Act call "communities of color" that they might not otherwise make based on purely economic criteria.
The original lobbyists for the CRA were the hardcore leftists who supported the Carter administration and were often rewarded for their support with government grants and programs like the CRA that they benefited from. These included various "neighborhood organizations," as they like to call themselves, such as "ACORN" (Association of Community Organizations for Reform Now). These organizations claim that over $1 trillion in CRA loans have been made, although no one seems to know the magnitude with much certainty. A U.S. Senate Banking Committee staffer told me about ten years ago that at least $100 billion in such loans had been made in the first twenty years of the Act.
It's merely a starting point to get you to see that YES, government decree made the housing crisis. YES lenders figured out how to game the system... but guess what dear? They wouldn't have had the "Game" had the Gov. not created the conditions IN THE FIRST PLACE!