This thread can continue to avoid the obvious or can accept that people will readily uphold a code of respect once they know simply what is expected of them.
Queen Victoria taught the nation thereafter how to respect something that has passed, despite appearing during the Boer War the wake of the Great War led generations of people to honour newly created memorials to ordinary soldiers they didn't know that died in wars elsewhere, but they still struggle to come to terms with engaging with ancient monuments.
Without guidance people fail to close gates in the countryside and drop litter, and similarly fail to respect ancient monuments. Only afterwards, on learning more, might they stop and think they could have approached it in a more respectful way. That is what the code cuts to!
The problem with stoneheads is that through the particular nature of their individual experience and personal approach they continually focus on differences between us all, rather than what binds us. Yes some of us would never climb Silbury or a stone just to get a photograph, yes there are those among us for which that photograph is all; but none of us want to see monuments damaged by people that just act as they do with everything else and fail to respect it. Adopting a code and getting behind it irrespective is what will work.