I think we have a recession (and possibly a depression) in our hands indicating quite the opposite "human greed trumps logic" I am afraid.
It shows many things, but nothing related to a free market, because the market that failed wasn't free, the people aren't free and so on.
I do agree with you regarding the banking corporations, they should have never allowed them to grow so big for starters.
If they didn't want a few large banks only, they shouldn't have regulated to make the barriers to entry so high...