Interesting story. I admit I tend to fall on the side that says that we are all responsible for our own actions and choices, and so shouldn't blame others if we get sucked into a scam.
However the one part that I find hard to stomach is the banks. They knew how overpriced these properties were, but because they had the security of a family home, they went ahead and lent the money anyway. No, they weren't under any obligation to mention how overpriced the houses were, but I find it sad that nobody seemed to think they should mention it.
One part that I found a little confusing, though, was why did some of these people lose their family home? In the end, if you don't sell the IP and you make your payments on the loans, you shouldn't lose anything, no matter how overpriced the IP was. That suggests to me that it wasn't the IP that was the problem, these people never had the capacity to pay in the first place in the event of a problem, however temporary.
It just reinforces the idea - have your contingency plans in place!!