Most problems are caused by belief in one's own superiority. Thin people think that they are superior to fat people because thinness is societally accepted. Young people think that they are better than old people because they've more to look forward to, whereas old people think they're better than young people people they won't be inheriting this broken world. Muslims think that they are superior than Christians because Christians are infidels; Christians think that they are better than Muslims because Muslims are infidels. Atheists think that they are better than everybody because society tells them that theism is fantasy, whereas all religious people think they are superior than atheists because at least they've a chance, however slim, at avoid hellfire. White people think that they are better than black people because they have for so long had a far more advanced civilization. Blacks think they are better than whites because they... I'm lost on this one. The mother with child thinks she is better than the barren woman because she is providing a future for the human race, whereas the barren woman thinks she is better than the mother-with-child because her descendants won't be curs'd to grow up in this hellhole called earth.

If people would just treat each other as equals, no matter their condition in life, everybody would be much better off. Both the people being hated, for being hated is never a good feeling, and the people hating, for hatred is a damaging emotion for its bearer.