I'm not sure the MEL or dispatch parallel holds though. What does the wording on the MEL reg say - something to the effect of the aircraft cannot be flown with broke equipment unless blah, blah, blah....where the responsibility of the aircraft operator (crew, company, et al) is specific. As opposed to the seat belt rule, or as another example the requirement to obey all posted placards, or not smoke, lies primarily with the passenger. If a passenger decides to smoke, to what extent is the crew required to make them comply with the FAR? Can they use force? MUST they do what ever is necessary to make him comply? Back to the sick passenger example, if they're puking (or have diarrhea) is there really a requirement for the crew to put them in their seat anyway? Doesn't the crew responsibility end with doing their best to get them to comply, then when unable leave the enforcement/punishment up to the FAA after the fact?