Ah, we've been over this, but "homeownership for every American" was a de facto government sponsored plan.
That, and at the end of the day crashes happen. Always have, always will. Its built into human behaviour. The fact that it happened at the time that it did just makes securitization a convenient scapegoat, but that would be missing the point.
There were not really any derivatives to speak of in 1929. Still blew up!
EDIT:
We've also been over this, but the private sector did its share to push things forward, keep the charade going too. Many stupid and unethical things happened. But at least at the depths a lot of that got wiped out (between losses in stock markets and mass firings on the street). The fact that we're back at all time highs in the SPX is another story.
My only point is that the banks / private sector is not the wholly responsible party, as some (most?) seem to believe.
With tight regulations implemented by FDR and later Trueman, those wild swings were very much muted. The recession of 1958 was pretty deep but fairly short, and the recovery was very strong. The same thing happened following the oil shocks and in the early 1990s. Those recessions were bad, but nowhere near as damaging as either the Depression or the Great Recession.
It is not coincidental that the system blew up again after these regulations were relaxed. The securitization of mortgage debt was not a government policy, and in fact when they tried to regulate the derivatives market, Greenspan went ballistic and pulled in all the political favours he could to prevent the market from being reined in. He eventually got the chairperson of the Commodity Futures Trading Commission removed.
Brooksley Born and the CFTC Versus Alan GreenspanDuring his testimony before congress, Greenspan admitted he was gobsmacked that his belief that decision makers in the market wouldn't take excessive risks turned out to be very, very wrong. The problem is that the people taking the risks have no personal downside. At worst they take their golden parachutes and ride off into the sunset unscathed, while large numbers of people ended up losing their jobs, houses and retirement savings. See also ENRON and Worldcom. At least Ebbers did serve time for what he did.
It'll be interesting to see where the LIBOR scandal eventually leads.