Critically discuss whether there is a single unifying rationale for regulation?

discuss whether there is a unifying rationale for the financial regulators establishment of financial regulation. Which i found 2 so far which are 1) to balance the
interests of both the unprofessional consumer and the professional buyer. 2) the presence of social externalities like implementing taxes for protection of the community. Explore the areas and
discuss the importance and necessity of the unifying rationale if it exists.