Classroom group think. Teacher says something, a student or two agree. Then everyone in the class automatically assumes it to be true. Someone may think, "hey that's not right" but will quickly suppress that thought because the whole class agrees, so it must be true. Later on CNN they see the same "fact" preached. Therefor it is now a fact in their brain and can never be altered with other sources and logic.  Group think and herd mentality is such a human trait that the marxist school system is exploiting. Any unique and original thought in the university system is quickly shunned or laughed at. After an 18 year old gets shunned and laughed at for speaking an opinion by a whole group of people, they will never speak or even think that opinion again.