Ethnic heritage refers to the passing down of common ancestry , value, or tradition that given by the previous generation to the younger generation.
When ethnic heritage is given/taught to people since early age, it will influence the way they are thinking along with the way they perceive every information around them. Since political ideology is heavily tied by the way we think, therefore it also indirectly influenced by our ethnic heritage.
Egocentric thinking is where a person does not understand a situation from another person's point of view. This is normal in children age 2-7 who are in the pre-operational stage. it makes a person not to consider other people's feelings and becomes self-centered.