There are people that just have no fear of heights and some of them do get in trouble. There is a mountain close to our city and every year people climb it. Amateurs. Then they get up there in a tough spot and they panic and have to be rescued by the fire department.
My father was a carpenter. No fear of heights. He would walk across a ceiling joist easily which is only 2 inches wide. And those roofers. They run over the roof from one spot to another. Now there are safety harnesses but they hate using them.