I don't know anything about Columbus except in 1492 he sailed th ocean blue (or so I am told). But...
I have great admiration for people like Amundsen who gather as much knowledge and experience as possible, take great pains in preparation, make a plan and contingincy plans, and explore knowing they may not return, but also knowing if they do others will benefit.
I agree that competent adults should be able to act in any foolhardy manner they wish as long as it doesn't affect others.
I think it is too bad when people take risks without being fully aware of the high probability of a bad outcome and/or not considering other reasonable alternatives. I think it is absolutely tragic when friends and family have to suffer because someone didn't take time to learn from mistakes that have already been made. It is more than just "not taking someone else out with them". Families suffer from deaths. Taxpayers foot the costs of rescues/recoveries/medical care. If no one else is really involved, fine, but very few people are that isolated.