Earlier quoted context omitted.
How: https://www.youtube.com/watch?v=SO4zuO1XSxQ Who: Aside from Yosemite, the answer is "it depends", a lot of these are just set up by enterprising enthusiasts, often technically illegally, but few care enough to bother them. In some parks & locations they're set up by whoever manages the park / owns the area to attract climbers & the business that comes with it. Some people in the mountaineering / climbing communi…
Dislike is something of an understatement. For many decades, there has been a tit-for-tat war between sport and trad climbers. Sport climbers bolt a route, then trad climbers come along with bolt croppers and remove the protection. In many areas, bolting is carried out under cover of darkness, for fear of violent confrontation with traditionalists. The Dawn Wall has been a significant battleground in this war. The fi…
What you're talking about with Harding and Robbins on the Dawn Wall is a clash of ethics that is long in the past. Very few people consider it worthwhile hammering pitons into a slice of blank rock in order to ascend it and aid climbing in itself is less popular with respect to free climbing.