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Charlie Munger Wants Banks' Wings Clipped

I guess that they bought these particular bank stocks because they thought that they had good management and were undervalued.
I also guess that they believe that the banking industry needs to be reformed for the good of the economy. They have lots of money invested in the economy. Having a better economy is good for them and for everybody else.

This aside from the motive of honesty, which may be incomprehensible.