The best way to contribute to ignorance is to teach others. Not every Muslim has had the blessing to be taught Islamic history (myself included).
I completely understand where you’re coming from and I agree, I do my best to teach others when the opportunity arises. But I think it also has to do with self interest. I never learned history in Sunday school to the degree that I know now. I picked up a book and read or I listened to a lecture. No one ever taught me .. I just think majority of the Ummah is lethargic when it comes to such matters, or they take the word of their local Imam and that’s it. They themselves don’t go the extra step.