Why do our history and civics textbooks suck so bad?

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In some states, they are mandated to inculcate patriotism by state law.

Our textbooks are dumbed down, to say the least.

In history, at least, all controversy should be taught.

Were I to make a history book, it would be like Glas- fragmented, contradictory, complete, first-sourced, with all the dirty stuff.

And with pablum, too, actually, because when contrasted and collaged with the colorful stuff, the pablum's BS-ness becomes that much more stark.

In fact, maybe I'll write one like that if I ever retire...