That is true. Thinking about it, you see a lot of people who have very good critical thinking in their area of knowledge but fail in areas they don't know much about. If we generalize and take that to mean that critical thinking arises from knowledge, we can't force everyone to have knowledge about everything so they can think critically about it. But a scientific mindset, and specifically the scientific method and philosophy of the science doesn't require you to have any concrete knowledge about a subject, or any subject, to be able to apply it. I feel (note the use of feel, which implies intuition and not a research backed opinion) that just knowledge about how science in general works, and of the scientific method and how it is used to learn about the world would help a lot of people have a much more open mind to new ideas, and more importantly to give importance to research, instead of dismissing it.