Have you ever gone on a hike just to be wowed by nature? To see a freaking amazing view? Or sit in awe and wonder of an archaeological site?
Now let me ask, have you ever been sorely disappointed when you arrive only to find that every tree around your picture perfect campsite has been stripped of bark and dying?
Or every boulder on the top of the mountain with the freaking amazing view has been vandalized?
Or all the artifacts you came to see had been stolen?
This is where Leave No Trace principle 'Leave What You Find' comes into play.