Well, that is a possible attitude. Not one that somebody responsible should take if a crew or a family depends on him.
Anyway, nobody responsible would have sailed the Antartic seas with an old wooden boat like theirs if what was at stake has more then their own lives that they have decided to risk for the sake of adventure and the possibility to explore beautiful places. Given the circumstances and having a perfect notion that they were taken risks that they could avoid it is perfectly understandable that they think it was unreasonable to ask for someone to risk his life to safe them.
Anyway was you have said, a commendable decision and one that many that take unreasonable risks don't share.