Sallow
The Big Bad Wolf.
They make these "mistakes" because those "mistakes" aren't mistakes at all. They are, in part, what caused the crisis. They're not allow sufficient to explain the crisis, but no set of factors is. The problem is that the list of "causes" coming from your side of the aisle bare no relationship to reality.
These banks got in big financial trouble because they were heavily leveraged up with short term commercial paper and mortgage-backed securities. This was just as much of trouble with the merged banks and the ones which remained separate.
That is the reality. Glass Steagall wouldn't have prevented this. At all.
We had banking crises during GS. It didnt prevent anything other than banks making money, which people seem opposed to. They also seem opposed to banks not making money. Wish they could decide.
The issue is not deregulation, but regulation. With deposits insured banks have little incentive to be prudent with depositors' money. With bailouts as far as the eye can see they have no incentive at all. Remove all the Depression era regulation of banks and let the market sort out good from bad. It will punish bad players more effectively than any gov't agency.
You don't seem to know what happened during the depression.