“Time after time, history demonstrates that when people don't want to believe something, they have enormous skills of ignoring it altogether.” What is the meaning of this quote

It means that people tend to be ignorant when they don't understand or believe in something. They stop themselves from learning from it or completely ignore it and are unwilling to learn about it. In history a lot of the biggest issues that occurred were because people didn't believe in something that others did.

Explanation:

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nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.