People have done this stuff for quite a while. Not free soloing that particular rock formation in it's entirety, but free soloing big and difficult and if-you-fall-you-die stuff. Check out John Bachar
Crack-a-go-go on YT for instance, from the 80s. Another pioneer Ron Kauk did body doubling for
Cliffhanger and trained with Tom Cruise for the 2nd
Mission: Impossible film.
Wolfgang Güllich a German climber also did work for
Cliffhanger, before he fell asleep in his car on autobahn in Germany and died (a bit ironically perhaps). Cars are dangerous too but not a lot people are scared of cars. He was also the first to free solo
Separate Reality, a famous twenty-foot horizontal crack with the sky visible in an overhanging roof in Yosemite National Park (shown below, with Alex Honnold free-soloing it).
Answering your question (
who does this guy look at and say... those guys are ****ing nuts..) people are just different. A guy/gal doing this type of free-soloing thing could perhaps be crazy scared of spiders or snakes, for instance, or deep water. Or have an irrational phobia for bananas. Or massive social phobia. I dunno. People are just wired a bit differently. As for Honnold, he just lacks normal response in the amygdala.