In this instance it is you who needs to 'get real'!

We are not talking about stopping complete fucking idiots damaging sites for kicks! Twat! <backspace><backspace><backspace><backspace><backspace> Sorry ...

Nothing will deter the nuts who will carve swastikas into things or dawb them with paint, but you can let the good folk out there know that there is something important on a rock that they should avoid using as footholds.