Surely most people (excepting swastika carving types) are quite reasonable, and many of these climbers probably know nothing about the rock art. I'm sure if they were told about it most of them actually would be interested (after all, they are Outdoors Types and probably interested in keeping the environment reasonably nice). Consequently they might at least try not to erode it even if they carry on climbing round it. Aren't people generally ok? I think you're being a bit cynical (and I am queen of cynics).
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