Indoctrination is a major roadblock to critical thinking. When an individual is surrounded and constantly fed a one-sided view on things like personal beliefs or politics, it stifles critical thinking. Children and students are especially vulnerable to this, so critical thinking must always be encouraged. According to the Association of American Colleges & Universities, teaching students to be skeptical will "help them see through the distortions of propaganda, and enable them to assess judiciously the persuasiveness of powerful emotional appeals."
Lack of Intelligence
An article by the University of Phoenix, entitled "Can Critical Thinking be Taught in the Classroom?" asserts that a critical thinker "would need a level of intellectual and cognitive ability." The article implies that some people are more adept than others when it comes to being skeptical and analytical. This is understandable, because people who lack intelligence will find it much easier to simply accept certain ideas at face-value than take the time and effort to research them. According to the Media Awareness Network, "Critical thinking is about how to think, not what to think" and requires "curiosity, open-mindedness, skepticism, and persistence.' In other words, you cannot think critically if you are ignorant of its process. Critical thinking is not about assuming that everything you hear, read or see is potentially wrong. It is about taking any information provided and analyzing it using the critical thinking process. Without this understand, critical thinking skills will be nonexistent.