I think the criticism on here is not too harsh and could have been predicted by people who knew he was doing this. Many people see the father as the protector of the household. Sure, this view plays into traditional gender roles, but to deny it would be to ignore the reality of how many people think.

By going off and risking his life on a personal accomplishment, he wasn't doing the best job to protect his family. There are an unlimited number of other ways that he could have challenged himself physically and mentally without the risk to the people close to him.

This isn't a criticism of John as a person, but a decision that he made. I don't know who he was and I'm sure that he was a great man. But he put his family at risk to pursue a challenge that is mostly a boost to his own ego.