Why do people always bash what they do not understand? OK, you are not a thrill seeker or an adreline junkie, but looking to ban such activities is VERY, VERY slippery slope.
The damage to the arch is primarily rope groves left in the soft sandstone by ropes when they are not properly protected. This is unfortunate, but can be greatly minimized, if not eliminated, by proper rope protection and placement. The problem, as with many human activities, is with the inexperienced or untrained.
But for argument sake, let's agree that some damage does occur that violates the sacred "leave no trace" philosophy and thus the activity should be banned. Then, by similar reasoning, we should ban the sport of canyoneering in most places. And rock climbing too. And what about all those backcountry trails? Or those unsightly backcountry campsites and fire rings? Or all those man-made bridges that have been installed to make backcountry travel less dangerous? Why stop there? Let's do away with the cables on Half Dome and up to Angles Landing, the high Sierra camps, roads, atv trails, etc, etc, etc.
And how is thrill seeking inherently "selfish" or "irresponsible". What constitutes thrill seeking for that matter? To some, hiking in Yosemite would be thrill seeking, or climbing the cables to Half Dome. My mother things backpacking is dangerous. And she just about shits her pants when she sees what I do while canyoneering. How about rafting through the Grand Canyon. Or sky diving. Or riding a motorcycle. Rock climbing? Skiing? Where do you draw the line - and for that matter, why would you?
Should all activities be allowed in all places. Of course not.
Should people be require to demonstrate a certain level of skill or knowledge or fitness before being allowed to engage in certain activities? Hell, that's and even more slippery slope.
But to make blanket statement that thrill seekers are all selfish or irresponsible (or even young) is, well, idiotic. Hell, the term alone is meaningless as it is all purely relative.
Calling for a ban on an activity simply because you do not understand the motivation of its participants is also idiotic.
Just about every statement made above is a meaningless, poorly thoughtout, overly simplistic, knee jerk reaction.