system
Given the following post, respond as if you're commenting on Reddit:
human
[DC][Justice League: War] How come the Green Lanterns do not know who Darkseid is?

So as I was watching this, it got me thinking, not only Hal didn't know who Darkseid was, but the ring couldn't scan it, he even claims the ring knows what the Guardians know. Assuming this New Gods and Old Gods thing is as big as it's made to be, given how strong they are and the scale of the threat Apokilips seems to be, isn't it weird how the Guardians of the Green Lantern core simply do not know any of it?
gpt
One thing you need to know to understand GLs is that Guardians Lie. What they truly know has surprisingly little bearing on what they tell the Corps, especially during one of the (many) times they're attempting to manipulate the Corps to serve their own purposes. 

Essentially, the Guardians probably know about Darkseid, but for one reason or another, decided not to tell the Corps about him.