Banks interact with the legal system at every level. So yes there maybe terrible human behaviour at times but very quickly it results in either (a) people bein

Banks interact with the legal system at every level. So yes there maybe terrible human behaviour at times but very quickly it results in either (a) people being fined or going to jail or (b) laws improving to prevent it e.g. KYC/AML. Also as someone who works at a bank there is a lot of code which governs what people can and can't do.