What choice do people have but to live in Saba? Well, for starters there's St Maarten less than 25 miles away with maybe not world-beating but much better medical facilities, and with excellent 24-hour international connections to places with any kind of specialized care. What's to stop Sabans from living in St Maarten? I can't see anything but choice.
If the doctor who called for the helicopter gave the crew an accurate assessment of the situation, that the patient could be evacuated by boat but that the helicopter would be better and reduce the medical risk for the patient, then he has nothing to blame himself for. It is the pilot's responsibility and he is trained to assess the risks involved with a proposed flight and weigh them against the benefits of succesfully completing the flight. If, however, the doctor presented the situation as if the helicopter was the only alternative to the patient dying, then he is (partially) guilty of the deaths of the crew.
My experience in this area was that presenting medevac flights as "do or die" situations was the norm rather than the exception, and that people were inclined to put moral pressure on a pilot to attempt a flight against his judgement.