We live in a world which may be very different in many respects than we think it is. We watch television or read a newspaper. We perceive most of our world via the communication of others. Everyone tends to want to communicate particular viewpoints or perspectives at the expense of others. The second reason is due to gullibility .
Most people are very gullible.
As children, if we didn't believe our parents, they punished us emotionally and even physically. As a worker, if we don't believe the boss, we may be fired. Everyone in society is subjected to enormous peer pressure to conform. Another important reason is that very few people have developed the consciousness and thinking-skills necessary to critically question everything they are taught, and what they see, hear, and read. There are some areas of life where practically everything the average person believes is false.