> taking fiction as source of historical reality

As opposed to all those reliable primary sources our concept of history is based on?

There are many good historical prmarty sources - yes.

I don't know who told you all primary sources are reliable. Historians don't say so. And yes, fairly reliable primary sources exist, then again I would not gave them to kids to read.

But, 2000 fiction whose primary goal is entertainment is in fact not reliable source of history.

They won't care about anything you say if you don't grab their attention first.

Ancient Greece in a little cartoon in a history textbook is boring, running around ancient Greece being spoonfed a little classics is fun and visually appealing.

Ancient Greece history is boring, because it is so absurdly superficial and unreal. And pointless. Most of what people imagine as ancient history is closer to myth making then history anyway.

And creating in them completely wrong idea about how it functioned may he fun, but I would preferred to skip whole topic if you have to do that. Boring but at least sorta true is better then cool but mostly elaborate diorama.

A lot of the history they are being taught is in any case fiction.