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Cairns are used as trail markers though, and were once used (maybe still used by native americans or isolationist scands far up north) as religious markers to designate a holy place. At least in the former case it would be pretty stupid to knock down a cairn marking a trail, especially in the mountains you can't tell where the trail goes without them. In the latter case, well, see pic related.
Go ahead and knock down all the dumb balancing ones, those are just silly
