Because others are exploited and risk their lives to get these people up that peak. If it was only them going up on their own without expectations to be rescued if something goes wrong no one would have a problem with it.
Are they really being exploited? Or is it just something they do for money of their own volition?
Have you asked the Sherpas how they feel before you started calling them "exploited" and advocating for the destruction of their lifestyle?
Because I find it genuinely pathetic. That's what I considered cool when I was 8 but then I grew up and realised my actions have consequences and that life isn't about literally consuming as many things and experiences as you can regardless of the externalities.