Hard-hitting questions already!
If put in such a situation, I don’t think I’d put myself above eating any human body part of nutritional value.
Deciding who gets thrown in the kettle though: Aye, there’s the rub.
All other things being equal: I guess you first go with anyone who dies of natural causes, then take volunteers, then take a democratic vote, survivor-style.
Having not seen those movies though, not sure how those situations played out.