From an academic

Former Federal Reserve Governor Frederic Mishkin, a professor at Columbia Business School, said it was "a huge mistake for the government to think it knows the best size of financial institutions." At the same time, he acknowledged that financial institutions are encouraged to get too big "because they are likely to be bailed out."

And I suppose allowing banks to get as big as they wanted such that they threatened the economic viability of the world is a "minor mistake?"