So whilst obviously there would have been individual instances of home buyers irresponsibly taking on comments they couldn't afford, or not factoring in risks of redundancy etc.,the overall failure was a systemic one.
Thus regulatory reform - includes rules regarding interest rates, miss-selling, income verification and stress testing, and overall transparency of the process are required.
However larger systemic measures are also required to reduce the toxicity of existing assets - which are threatening a depression greater than anybody might have reasonably anticipated (except for a few professional economic doom mongers - mentioning no names!) - and thus measures like interest rate reductions, repayment moratoriums, income tax deductions for interest and other incentives to stabilise house prices and the ability to fund associated costs are required if the market isn't to melt down completely.
This isn't a purely Wall street problem - individual home owners also needed to be bailed out to a degree, and those banks which abused the process need to be reformed, taken over, or shut down and replaced by those that will - as is already beginning to happen. Vote McCain for war without gain
Homeowners that default on their mortgage should have the home taken over by the state and rented back at an affordable rent. The banks should be paid up to a smaller-than-one fraction of the current value of the house - say 80 %. If the bank has loaned out more than 80 % of the current value of the house, they have ipso facto been behaving irresponsibly and get to take the loss. If they have loaned out less (unlikely, since we're talking about people who default on their mortgage, but still), the owner gets what's left of the 80 % of current value.
If and when the current occupants move out, the state can rent out the property to people who are otherwise unable to find a home - whether due to a poverty or other social ills, thus securing that everyone in society has roof over his or her head.
- Jake If you only spend 20 minutes of the rest of your life on economics, go spend them here.