Some of them have become allies, or people we've been able to help. Some are simply scared. [The only one she think of likely to use it for bad off the top of her mind is probably Hades - and so far, even he's only gotten some creepy fog for the Underworld out of it.]

And some, knew it back in their world. Zoisite, and Kunzite when he was here. Maybe Nephrite, too, when he was.

However, we should still be cautious.