In my opinion it's all about a lack of respect for others.
We are at Yellowstone right now, and yesterday my wife commented the "did you see the little kids throwing stuff in the pools?" I missed it because I was taking pictures, but I wish I would have seen it because I would have absolutely said something to the mother that was paying no attention to her children as she sat on her a55 with her back to them. How in the world do you allow your children to destroy or deface something that God and nature took thousands of years to create???
And yes, I am that guy!
Doug