"Again?" Just like last time. He cured them, then, and they haven't asked him to do it a second time. What does that say about them and their drive to live?

Probably exactly the same thing it does about him. They don't care. They'll throw themselves over the Edge rather like he does... and he'd be a hypocrite to stop them.

So he won't.

"That thing... should have learned the first time around to let me sleep. I have nightmares enough as it is."