Ultimately it comes down to real contributions. Aren’t banks fundamentally meant to provide capital for real economic activity? Provide an overarching mechanism to keep money flowing to activities that facilitate worthy endevours. Banks should spend all of their enegy on simple banking. Simple banking adds to the betterment of our system and still creates a profit for them. All of the other stuff they’re involved in, like trading & creating complex securities adds no real value to our existance. Those activities have no essence.