It is very easy to limit one’s views to those that one already believes. It is hard to entertain ideas that are in contrast to one’s own. It is an unfortunate–and uncomfortable–fact that all progress for humankind is obstructed by the status quo, but instead dependent upon the ability to entertain ideas that are radically different from one’s accepted notions.
If our preconceived notions were perfect, limiting our viewpoint would be fine. On the other hand we–as humans–are not capable of perfection, so our preconceived notions are, therefore, invariably flawed.
Unless we make an intentionally conscious effort to try to be open to other viewpoints, we remain stuck in one spot–intellectually, culturally, and spiritually.
Our self-imposed intellectual limitations are embarrassing. If an advanced alien species were to view our interaction, they would be well within their rights to either isolate us from the rest of the universe, destroy this planet, or at least remove the human infestation for the benefit of all.
I, Diogenes, died many centuries ago, so I am not at risk. How about you?