A series of bank scandals, leading to large fines, are the predictable result of deregulation.

I suspect that the fines are not big enough to motivate the bank executives and shareholders to try to prevent more corruption. In the US, they aren't. The result of inadequate fines is that the executives would like another corrupt scheme to make a lot of money followed by an inadequate fine.

Complicated and changing banking systems will tend to offer new opportunities for corruption. Let's have a simple banking system that changes little.