People are not equal. There are genuine, substantial, necessary, felicitous and desirable differences among people, differences of ability, temperament, impulse, desire, destiny and more. These differences are society's endowment. Lose them and society dis-integrates. Integration is of variety, not of similarity.
Similarity requires no integration.
It is unproductive. The differences are the thing that is truly valuable because they are what produce. The program of education cannot be 'all for one' or 'one for all' because the little nippers are not all one. They are many and different and their differences are important and needed. The idea that all children should go through the same general program is totalitarian, which means, inherently stupid.