Goldman did not tell the purchasers that they were buying an interest in loans hand-picked by Mr Paulson, who took a very bearish view of the subprime market.
Pessimistic session locking should be used with great discretion, as it serializes access to data across a business process that includes user think time.
Keep in mind all of these figures are nominal, meaning they aren't adjusted for inflation. If they were, the report would likely contain far more negative signs.
Glaringly pessimistic, the first law is meant to prepare you for what's out there, and what's out there are hordes of people who do stupid things, often without notice.