Why?

 Since I'm not good at psychology, I couldn't really understand why Hitler and the Nazis felt the need to eliminate different types of people. One of the reason that I could think of is that they are racists who believe their races are the best, such as Darwin's theory-- The survival of fittest. In fact, that is pretty unfair to the other people, because everyone is worthy and precious, we can't deprive the chances and eliminate value by races nor appearance. Another reason that I think of is that Hitler and the Nazis had been bullied by the Jewish in their childhood, so they started to revenge after they gain forces and power. Actually, it's no fair to the other Jewish, too. Because it wasn't other Jewish fault for treating them roughly, and they couldn't think that all of the Jewish is as rude as the Jewish who bullied them. However, I couldn't think of a rational answer, whether Hitler and the Nazis had encountered bad things that involved Jewish, they couldn't eliminate people's value. I think that the world would be better if there is more races and more groups, because the more types of people we have, the more creative and developed that our world would be.