Point of info Rhiannon, it isn't a case of "having some inkling about what the Done Thing is (as at Stonehenge)" people have the "don't climb on the stones and don't litter" message hammered home to them each year so it seems pretty likely failure to comply is, as you say a case of "just willful not-giving-a-shit."
(Unless of course we are to swallow the theory that dancing on the lintols is some gits idea of respect! Perhaps not, eh?)