Firstly,
you seem to be concentrating on a one cause platform.
Secondly, not really. The causes are quite well known.
Deregulation of derivatives trading planned by Republican Phil Gramm, passed by Congress, signed by Bill Clinton. This would allow for completely unregulated investments (some extremely complicated) and liquidity required to cover them.
A slow economy led to the Fed trying to speed things up by making money a bit easier to get. This helped the housing industry boom, however, it still remained the only thing booming (along with car sales thanks to low rates). The housing market kept booming and was obviously going into a bubble. It was talked about by many here and in the media. But it was the only driver during the W Admin. So they didn't want to stop it. So there was no pressure from them to increase rates to stop that bubble.
Ridiculous loans (ARM) were given to people in order to pretend they could afford a mortgage, what were meant to be short-term were given as long-term. It only worked while housing values continued increasing. Once they stopped increasing, it would become impossible to refinance.
Mortgage banks were lying on the mortgage forms to get people qualified for loans they couldn't afford. So that whole, "new underwriting" stuff causing the crash is garbage, because Countrywide still needed people to lie about their income, jobs, etc...
Severely complicated investments were created with mortgages and Ratings agencies treated them like safe investments. Large corporate banks who thought they were buying very safe yielding long-term investments, were actually buying investments that were junk bonds.
The Producers effect. Thanks to deregulation of the derivatives market, it actually became possible to create investments that would make money for the creator if it failed!
Credit default swaps were something that was created for a "just in case" scenario and seemed like incredibly safe bets on large corporations like Lehman Brothers who'd never go down.
So deregulation and criminally poor monitoring by the ratings agencies are the main causes of the collapse.
The government never came out and said, "Housing ownership is bad and we don't want people to buy houses"
In fact, it was part of W's campaign in '04 regarding the "Ownership Society".