Yes, collectives don't have special interests. Individuals have specific instances of universal interests, like security or freedom. "Black people" doesn't have a separate existence from a black person. By guarding the principle of equality before the law, you are not getting involved in anybody's business but yours.

It isn't right to view something like equality before the law as a matter of somebody else's self-interest, or to justify a ruthless pursuit of self-interest by recasting it as service of an imagined collective interest.