I suppose you are welcome to judge people as you please, but essentially everyone who hikes, skis, climbs, kayaks, skates, surfs, runs, or plays any sort of contact sport will disagree with you.
Dehydration was not the intent, it was supposed to be just a long desert hike:
> "I thought, I’m pretty tough. I can do that," Broyles says. He planned ahead and buried water caches at strategic points of the journey, which he described in a 1982 article. "Intending to parallel [Valencia’s] route, I had no design to parallel his plight," he wrote. "But the desert doesn’t always honor human plans."
Almost everyone who did sport on the highest level suffered irreversible damage. Of course modest training is very important and healthy in all aspects.