LoglineWhen Captain Burnham is trapped within a “mindscape” designed to test her worthiness to retrieve the Progenitor’s powerful technology, Book, Rayner, and the crew of the U.S.S. Discovery must hold off the Breen long enough for her to escape.
The Breen might have the ability to destroy the Archive, but with Discovery gone, it wouldn’t gain them anything and how ever long it took them would be time lost for chasing Discovery.
That's a hell of a gamble if your objective is to protect civilians (and likely a gamble they would lose, considering the Breen's actions).
why didn’t Discovery prepare a fake clue?
I think the answer is the same - it's not something you want to screw around with if you're trying to save lives.