These giant losses may be by design, or at least allowed to happen. It'll be interesting to see how fat Dimon's bonus is, for successfully exiting this money-losing trade. It used to be good to be king, now it's better to be "too big to fail".
IIRC about a week after it was first announced there could be a $2B trading loss at his bank, Dimon went to the Board of Directors and was granted a $23M compensation package.
There's a saying about pizza and sex. When they're good, they're really really good. But when they're bad -- they're still pretty good!
Banking: when they do well, they do really really well. But when they do bad -- they still do pretty good!