As an artist myself, I have always likened the destruction and desecration of an artistic object to be akin to sacrilege. Given that premise, I assert that pictographs are highly valuable artistic objects.
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Osoyoos Indian Band mulls closing pictograph site after vandals deface it with obscenities:
https://www.cbc.ca/news/canada/british-columbia/osoyoos-indian-band-close-pictograph-vandalism-1.5708751?fbclid=IwAR349kDsKLKfFCtrU_tszX1btWMZSvSzMwSEQCuQvIkdjarl-HWL97t6EDw