u/Anidran

I noticed Benzie propaganda grafitti was still appearing on 2 spots on the map. They keep reappearing even after I remove them. So I camped a spot for days until a Benzie finally appeared and I took him out as he was spraying. But after a few days there was a new tag on the same spot again. Can I ever get rid of them entirely or do they spawn indefinetely? Do they only spawn near empty spraying spots?