It's really the notion that we should make easy money from house ownership, and I'm not talking long term investment. Many Americans got into houses because it was cheaper than paying rent, or so they thought. Many others thought they could use their homes as an ATM. Others tried to play the housing bubble; look at all the new TV shows on flipping houses.
We lost the notion that home ownership is the reward for success, instead, we now believe that home ownership is the way to success.