A big part of climbing is risk assessment. You say, these are the skills that I have and this is how strong I am. This is the task I have to take on and this is how much of a margin of error I have. Can I achieve my goals while remaining safe? In the beginning of the film, they are 100 metres from the summit! That is 99% of the way to the top, but they turn back because they just don't have the safety margin to continue and then rappel back down again in time. That's where your experience takes over, these guys aren't some random dudes looking for a kick of adventure like those people who join the conga line up Everest, these are among the best climbers in the world.
It's like driving. For someone who's never been behind the wheel, putting them on the highway is insane, but for most of us it's a mundane experience. These guys are like the F1 drivers of the climbing world. They've honed their skills, so what seems crazy to the rest of us, is really well within their ability.
It's like
Alex Honnold who's notoriously famous for free soloing (climbing without rope or any gear) some super bold routes. It seems crazy to everyone including me, but then you realize that he routinely rope climbs 5.14's and for him to climb a 5.12 without a rope means he's going well well below his ability and it's on a route which he has practiced on a million times. So from his perspective, it's a walk in the park.
Skill can overcome danger, so your perception of it changes.
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