Actually, those history reports made a surprising amount of sense. If one didn't know beforehand that story was all produced by a fiction writer, one could see how the world came about the way those Ravenclaws described it.
And that was scary on its own.
One particularly well-read student even pointed out a little known fact - that dragons, as a species, were once far more intelligent, and thus dangerous, than they were today. Wizards had managed to transform them into dumb brutes, but only after generations of breeding. Wizards at dragon preserves still made sure to dose all newly-hatched drakes with intelligence-dampening potions as part of their first food out of their eggs.
And, Harry wondered just how potent those potions were, because wizards did eat dragon meat. The beasts were regularly slaughtered for their hides, also for dragon heartstrings for wands cores, and something had to be done with the flesh, so it generally got sold for food.
Dragon meat was an expensive staple to the diet of rich, upper class wizards like purebloods, and a 'special occasion' treat for practically all other magic folk, so if the effects of those potions survived ingestion by the dragon to get passed on to the eater of that dragon's flesh... well, that could explain so much about wizarding behavior!
They might be morons, in part, because they ate flesh treated with potions to make the ingester a moron. That made a scary amount of sense!
Then again, those facts might have nothing to do with each other. The idiocy could just be cultural. He saw plenty of evidence of that, as well.
Partially Kissed Hero, Chapter 60