Once you go outside of areas in which you have a high level of professional expertise, you don't really know how to ask questions or assess answers. When you don't have a disciplinary way of understanding things, you are not truly capable of critical thinking. Your mind no longer has discipline. In that situation, when given a range of possible answers, rather than the right one, you tend to choose the one that confirms your (undisciplined) perspectives or biases. At that point, it's easy to congratulate yourself for not being sheep, when all you have done is surrender to the tyranny of your own mind.

It is indeed truly difficult to be mindful of how little one knows.