Earlier quoted context omitted.
The SEC is not in the justice business. It is a puppet of the banks themselves. A $4M fine is NOTHING for a company netting $12.62B a QUARTER.
The $4M is a slap on the wrist, but if there's evidence that it was done on purpose, and the deleted data is evidence for a bigger case, they'd be in much bigger trouble still. But, innocent until proven guilty; if there's no indication of any missing evidence, it'll stay at the failure to retain data fine.
That is proof of missing evidence.