Shiller is an odd bird. He seems to acknowledge there is really very little that can be done to either "protect the stupid from themselves" or even to insulate the broader society from the negative consequences of their irrationality, yet he does strive to use the financial markets underpinnings to both create stronger financial institutions AND design more better forms of social insurance.
http://www.publicpolicy.umd.edu/IPPP...Exuberance.htm
Good luck -- I prefer a much more succinct maxim, often seen over desks of active finacial traders: Bulls make money, bears make money, PIGS get slaughtered.
In the present context, it is entirely plausible that an investor could purchase a damaged home at a deep discount in otherwise attractive area, make some cost effective repairs and sell it for a resonable profit. Thus the "bearish" seller would feel OK, the bullish investor could do fine.
OTOH a "pig" would underpay for the home, harming the seller, yet be unable to find ANY buyers and GET SLAUGHTERED end up in default himself.
No PhD, but I think Shiller and I may have more in common than either of would admit on the surface...