When I was about 16, one of the freeway bridge abutments on I-94 just north of Detroit sported some communist grafitti. One night, someone very artfully covered it with an American Flag made of oil paint. It remained for many, many years, undefiled. Finally it all flaked off.
I recall the graffiti artist Banksy and how some of his stuff is edgy, more often than not, progressive; yet he is discounted here by posters.