But it's not at all clear --- in fact, it seems unlikely --- that the core problem we face is a refusal by regulators to sue.
It seems more likely that the core problem is that the economic incentives in the finance industry, or at least in commercial banking, favor rapid and aggressive consolidation. Not enough disincentive exists to offset the externalities this creates. Maybe we should tax banks based on their sizes; maybe we should do that in the form of some kind of insurance premium.
But since anything we'd do to address any of the real problems is going to require bipartisan cooperation, first we need to be candid about what the problems are.
Completely different meaning. If ate a bar of chocolate in the library despite posted signs against eating and drinking. I broke a rule. If I threw my chocolate bar at the librarian's face with an intent to injure him, I broke a law (assault and injury etc.)
If not, that's surely something we can and should change.