I agree, but is it acceptable if the intent is good. ?
I obviously wouldn't piss on the stones of a stone circle as there'd be no need but if far from home with no water source around and you happen upon something that just may be a faded piece, what then. ?

As disrespectful as diggin up oil p'raps? Or - god forbid! - there's some animistic relationship, subtle perhaps, that's developed between some etchings on rocks and your good self...?