We learn norms from our surroundings. If everyone does it, everyone keeps doing it. Also, those of us in the brainy set generally equate our rational inner nar

We learn norms from our surroundings. If everyone does it, everyone keeps doing it. Also, those of us in the brainy set generally equate our rational inner narrative as the total of our self, underestimating how much of our behavior is driven by habit and unconscious reaction. This makes us very good at explaining away our poor behavior when it's exposed to us.