I'd like to at least borrow it from time to time, Wildhorse
But from my largely armchair knowledge of the subject, there is tremendous individual variance in altitude tolerance, and the odd thing is that it's not really correlated with fitness or lung capacity. It seems to be very much genetic. Personally, I start feeling really crummy any time after 9000 feet, and my sister gets a nasty headache just from driving up to Idyllwild. I hardly ever take the tram up because it's so unpleasant being suddenly swooshed up eight thousand feet.
Back somewhat to the topic of the Kern River, I suppose it's true that wilderness recreation is already completely commercialized and as ruthless as any other form of capitalism. After all, drug company executives don't lose sleep over medications that kill some people, people who manufacture plastics know they produce carcinogens, etc. But to directly intervene to prevent a sign from being posted that would save lives? That seems so coldly ruthless that I would have thought most normal people would flinch. But I guess not.

Q: How many therapists does it take to screw in a light bulb? A: Only one, but the light bulb has to want to change ...