Dodd-Frank was supposed to wind down too big to fail, and introduce more objective oversight into the industry. But, under its decree we've seen further consolidation of financial interests which, by their growth, makes the financial industry less competitive, and fundamentally more vulnerable to future market disruptions than it was before Dodd-Frank.
Dodd-Frank has taken a dire problem and exacerbated it.
Why do Democrats care more about rigging the game for their electoral constituencies (redistribute resources downward) than fixing the game so that it isn't rigged in the first place?
I'll tell you why because they are every bit as interested in succoring their rent seeking electoral constituencies as you accuse Republicans of being.
While I can't argue that the Republicans don't do this, I can argue that at least we don't contend that doing so is fair innately because of who our voters are. Currently this status quo exists because both parties prefer bending a rigged game to their electoral benefit than creating a legislative framework that can't be bent.