If you strip the horrors of history from history, the flip side of that is you strip the nobility of rising above such horrors.
Yeah, dolphins and monkeys basically could play chess together. Those are brilliant animals.
Thinking critically is a chore. It does not come naturally or easily. And if the fruits of such efforts are not carefully displayed to young minds, then they will not harvest them. Every school child must be implanted with the wonder of the atom, not the thrall of magic.