Of course damage is important. Why for example, do people get upset about Silbury Hill being climbed? Is it because it's damaging the structure? Or because they think it should be fenced off from the rest of society, so that it can only be viewed from behind a velvet rope.

I don't agree that these monuments should be preserved behind glass. If it's possible for people to interact with our heritage without damaging it, then that seems far healthier than removing them from public contact.