I’d just like to pick up on this point:

“…if by allowing the jailor to torture you, you save someone else from being tortured (that is 15 minutes of every day that you may be bearing another's pain), then you seem to have a moral obligation to accept the deal”.

This raises another issue that underlies this kind of discussion. Where does the moral obligation we’re talking about here come from?  Supposing I can spare another prisoner 10 hours torture by undergoing 5 minutes of it myself, why should I?

Moral obligation is not like a profit and loss balance sheet. So where does my obligation come from? Don't you need to establish that first?

DA