Also, I would like to point out that I don't think of the slate as graffiti - it's a natural material and the message was written on that. The graffiti I was referring to was writing on stones and such.
What I would like to avoid is a situation where we're using the countryside or nice place where people go for a walk as somewhere else to go 'Hey - here's my opinion on this'.
I don't want to see it, even if I agree with the message. In national parks we already have problems with umpteen rock stacking showing up. One person does it, then another, then another, then another, then another, all wanting an Instagramable pic and and opportunity to say I WOZ 'ERE on somewhere beautiful before they return to urban settings.
In once small place I counted 50 - 70 of them. Things like that quickly add up and become an issue and a bloody eyesore. I do not want to see the same thing being done with political messages, however small, even if they are lovely or I agree with them.
I understand this may be an unpopular opinion and that people have decent-counter arguments to it, but I would like people to consider thinking about the matter differently or try to see where I'm coming from.
Sorry for the derail though :/