A narrow world view is one which results from a limited stream of information. The purpose of education is twofold: to increase the size of the information stream and to increase the ability of the student to tell truth from rot. When these two conditions go hand in hand, a student can read anything, evaluate it, take from it what is truth (and not rot) and thereby increase her/his knowledge. Discouraging people from reading something is only a good idea if your educational system has made it impossible for the student to distinguish between the logical and the illogical, the truth and the rot.
If you are the age I think you are (from your posts) then you DO have a lot of reason to discourage yourself and others from reading something. Since the late 70s, the educational system in this country has been modified to control the information stream (curriculum) and to decrease the ability of the student to tell truth from rot. As a result, the younger generation cannot read with discernment; they have not been taught elementary logic and have no understanding of how one separates the truth from the rot. They only have their emotional reactions to what they read, and these emotions can cause shifts in basic beliefs and principles very quickly, hence the desire to avoid reading anything outside a narrow comfort zone.
Because you react emotionally, you assume that others do. You do not understand how one can hold certain basic knowledge and principles, regardless of emotion or personal (or group) allegiance. This is why you do not understand (1) why I am not voting for your candidate and (2) how some of us can talk across the aisle without complete capitulation. It might behoove you, Eyelids, to actually separate yourself from your knee-jerk emotional reactions and try to understand that everyone has a side and that some concerns are legitimate even when you do not agree with some of the values a person holds.
But it would take a different kind of education to do that, and I think the post-modern curriculum has already affected you too much.