According to research by psychologist william perry, students entering harvard university tended to have a view of the world where they reasoned that something was good or bad; people were good or bad; or others were for them or against them. he called this

He called this "Dualistic thinking".

The thought of dualistic thinking, that there is a decent and malevolence approach to be, that individuals and things ought to be classified by specific gauges meets the possibility of poisonous quality and purety of thoughts. Dualistic thinking is the way a great many people think and act, it is the "us versus them" syndrome.