Uluru rises 380m above the surrounding plains and most of that is done in one continuous rise form the base so a slip near the top can have devastating consequences. And when they get to the top all they do is look around once, maybe twice, and then walk straight back down get in their car and drive on. We spent an hour walking around up top and it really is an amazing place. Personally I would like to see the chain removed as it is not essential to climbing. This would ensure that people who climbed it would take the necessary precautions and maybe even appreciate Uluru for what it is.
Some experiences have to be earned.
The best way to see Uluru is by mountain bike. Kata Tjuta on the other hand is another story. Climbing there is prohibited and many of the rocks are too steep to safely climb anyway. Some of the rocks of Kata Tjuta are higher than Uluru. The national park is probably the most regulated park in Australia.