Why are people racist?

People behave like animals, when they get harmed once by a human they get a response in there brains that makes them never get close to another person that can harm them. Well like us if we are harmed by someone or we see people getting harmed in movies by a certain race or kind of people, we get a fear of getting hurt by that same race, we create like a respone in our brains that when we are close to a race that can hurt us we dont get that close so we can defend ourselves. Everyone has some kind of racist beliefs, but some people develop it more than others, some people use racism as a weapon to defens themselves, they keep close to the people of the same kind because they are in their comfort zone. People are also racist because they are afraid of things they dont understand and are afraid to comfront the way they feel. Also because some people are ignorant and they dont get to know the other kind of people before they judge. So in conclusion we think that we never will understand the other races so we stay with a fear of getting hurt by other races.