What about customers that slide into unsavory activity, or customers who you think are doing illegal things, but don't have evidence to prove beyond a reasonable doubt? Are citizens not allowed to decide not to associate with someone?

I otherwise applaud your commitment to the rule of law.

Citizens as individuals, sure. But banks that are massively concentrated are more like public utilities not individual citizens, in terms of their criticality to a functioning society. They need to be regulated like that.

How often do cellphone companies ban drug dealers?