"Destruction or damage - and postering causes neither." Well, I suppose. If someone puts posters that say "Huzzah for the BNP" (a fairly uncommon thing in New Mexico, granted) on my car, and the paint doesn't come off until I try to remove them, it isn't the people who put them on who caused the damage, but the person who took them off. If I happen to like a bright red car, and prefer that appearance to a plethora of posters and stickers, that doesn't mean that those posters are actually damaging anything. The same applies to buildings and the owners of them. They clearly have no grounds for complaint.