Thanks for this interesting and helpful piece. I hope you'll consider doing something more in-depth.
Many of the greatest artists throughout history have expressed a great deal about political issues. Off the top of my head and in no particular order, one could talk about Alfredo Jaar, Anton Vidokle, Banksy, Cao Fei, Carl Andre, Critical Art Ensemble, David Cotterell, Goya, Graffiti Research Lab, Gregory Sholette, the Guerrilla Girls, Hans Haacke, Jenny Holzer, Joseph Beuys, Judy Chicago, Keith Haring, Leon Golub, Liam Gillick, Mark Lombardi, Martha Rosler, Mel Chin, Nam June Paik, Nancy Spero, Paul Villinski, Picasso, ®TMark, Shepard Fairey, Temporary Services, The Yes Men, Trevor Paglen, Walker Evans, Yoko Ono, and many more.
Sure, there's "bad" political art, just as there's "bad" non-political art; but personally, I take it as a good sign if a work shows evidence that it was generated from a larger, integrated understanding of the world that includes the political.
And I believe that great art, including political art, does indeed have profound and far-reaching effects; and not only on "culture," as narrowly defined. There's a reason why Queen Elizabeth I censored a production of Shakespeare's Richard II, and tyrants fear artists.
So, thanks again, and I hope to see more on this subject.