It is amazing to talk or read people who consider themselves to be independent thinkers to find that they are really parrots. Yes parrots. They simply repeat popular sayings, thoughts, and philosophies simply because they are the current trend.
When you discuss almost any key topic with them they flounder when challenged on why they think the way they do. They have no depth of thought, no personalization of the topic, and they produce arguments which are not thought out or do not support their contention.
In short they really don't think they just parrot what they read in the paper, watch on TV, or find on the Internet. They are not independent thinkers because they don't think about the topics they just digest what they are fed.
Thinking is a skill that needs to be practiced to become good at it. People who have thinking skills do not usually think that their viewpoint is necessarily the "truth" but an ongoing exploration open to question and revision. They are prepared to listen and discuss.
In boils down to the fact that the second you don't think then you follow. Something to think about.