You can parse the stories about how the bank's risk-management people loaded up on risk, or digest the accounts of how JPMorgan's financial wizards engineered mind-bendingly complex means of limiting their vulnerability to troubles in Europe. But the simplest answer is the most pertinent: It's extraordinarily complicated.
As one of the only banks that remained profitable during the financial crisis of 2008, JPMorgan was considered by many to be the sturdiest bank in the...