Isn't it because if they don't do it, this place becomes worse than what it is? [ that's what Kaneki assumed at least. They do things like that because they probably believe they have no other choice

but at the mention of the ring of salt, Kaneki pauses. Actually, he has heard of that before, about salt... so perhaps: ] Have you tried to see if salt truly works on these spirits? [ it's a different world... it doesn't always work the same way they remember, does it?

But if it does work, well, kaneki is more than happy to use it. ]