Well I for one hope they don't over protect, ive been once before and was bitterly disappointed at the restricted access, hoping to one day have a proper look round and get into the place proper. Granted , if I find anyone wirth a sledgehammer or spraypaint their body wont be found for several days.
The idea that only an outsider would be that much of an arse to deface it is I think setting the islanders on too high a pedestal, there are arses everywhere and I mean everywhere.