Ignorance is curable, being simply a lack of education. All of us are ignorant, about different things. Many on the left are ignorant about guns (as I've notoriously said before), I think in large part due to their primary exposure being popular culture, TV and movies that have been feeding them twaddle since birth. Some are completely ignorant of how financial markets work (me), or the fine details of how electronics work. Whatever the area of ignorance, it can be eliminated by simply acquiring information.
Willful ignorance is a horse of an entirely different color. Intentionally ignoring information on a subject in order to maintain a death grip on an ideological position can't be solved with information the ignorant person will not take in. When their entire worldview absolutely depends on maintaining a fiction, anything that upsets that fiction is unacceptable, and is automatically rejected, regardless of fact.
Creationists are, in my opinion, the foremost proponents of willful ignorance in American society.
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