Why?

The Nazis felt that they needed to eliminate many types of people expect themselves. They has this thought in their mind is probably because they thought that they are the best people in the world. Other people are extra things that are not important. They thought that this was necessary because they wanted to be the only group of people in the world. They don't want other people to be part of or be involved in their own world. It would probably be better if there were less people in the world, there are several pros and cons about this. The pros are that if there were less people, there would be more spaces for you. With less people, you wouldn't have to live in a crowded city. The cons are that if there were less people, there wouldn't be a lot of business going on. If there were no business, you would have to make or do everything yourself. Take buying food for example. If there were no farmers to plant and sell the crops they planted, you would not have food to eat. You would have to farm and plant your own food. The lesser the people, there would be more things for you to do yourself.