Stage 3. Interpersonal relationships. The ideal of "good boy", that is, what pleases others is good.
Kohlberg's findings consolidated the understanding that morality is not innate. However, moral attitudes do not reduce adherence to heteronomic parameters either. As a result of socialization, the stages of moral development occur at different stages for different people. As a result of socialization, there are ethical and legal implications regarding the judgment of others' moral behavior.
How do you prove that the distance between one black dot and one white dot is one unit ? You don't, because it's false. If all black dots happen to be on the line and white dots on the line (and the rest of the plane is neither white nor black), there is no such pair.