The idea is that harming "Wall St." will help consumers, but you're right that it's secondary to helping them first.

Lots of problems Dixon listed revolve around fees, and my guess is that a lot of people feel ripped off by the financial industry because it makes tons of money while not seeming to provide equal value.

Any disruption that lowers the costs of doing business helps both customers while achieving Dixon's goal of disrupting the establishment. This is true in many industries.