I doubt that it is as simple as people being "too stupid". It's more likely that they have a different criteria for what should be taught in schools - that what they want their kids to learn comes higher in the decision making pipeline than subject/content organization. Then they try to justify the place that these priorities take them.
I you persist in thinking that everyone who think things you can't believe is stupid, you'll never talk to them in a way that will change anyone's mind - not theirs and not yours. This is true of a spectrum of topics.
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Cogito ergo spud -- I think, therefore I yam
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