Why does vanity motivate so many women and men?

Human nature 4 some: Some people have inflated opinions of themseves, take themselves too seriously and consider themselves superior to others.. Exact opposite is true of others. No two people are exactly the same. Why are some people died in the wool democrats and others republicans and often neither can understand why the otherside can possibly hold the beliefs they do. Logical humans ought all to be independents.