3) It is slightly ridiculous to suggest that anyone intentionally started a housing bubble to cover for a stock market crash. You're looking at nearly 8 years of Fed policies of keeping interest rates low, with wide-spread resistance to the Fed raising any rates. Plus, again, many other factors had nothing to do with any government policies.
In terms of "moral hazards," it's worth noting that before the modern Fed was created, the banks often bailed each other out in similar crisis. Oddly enough, no one seemed to fear the moral hazard when private banks were taking on the role of the "lender of last resort." Hmmm.