Imagine the concept of democracy, the power is from the people but with that power, they still need to select a leader that will maneuver their country. The same with cryptocurrency, even if we have all the power to regulate and serve as the new body of control, we will still consider having an entity to lead the way to organization and control. Basically, the regulation will be outside of our scope, thus, making transactions possible abiding laws and rules set by the constitution.