@tsarstepan,
I don't pretend to know where the money went, but yes, for every loser there is a corrosponding winner. Nothing wrong with that. Nothing wrong with a business occasionally losing money, or even being forced out of business. It happens - or at least that's what should happen.
The problems arise when a bank, as opposed to other business, gets into trouble and we discover that the government is on the hook through FDIC for insuring depositors. A bigger problem comes about when the government (WE) are expected to bail out the bank beyond deposit insurance. Suddenly, we discover that when there are loses, the banks have been gambling with other peoples money. Ours.
Could be we need more regulation. Could be we need much less, but much clearer regulations.