Why do you believe this was a low-probability event? My impression is that important safety measures were neglected, and this laxity played a key role in the failure.

A better question might be "Where else has avarice gotten the better of known sensible precautions?" I hear there are clear risks in the Commercial Real Estate market, similar to the problems which led to the residential housing crisis. Then there is the fact there has been essentially no meaningful regulatory reform of the financial system as a whole (in fact, there has been encouragement of the same bad behavior.)