There’s a common myth in American culture that only the left is capable of producing great art. Right-wing art must be formulaic and preachy because it values established norms, while only transgressive leftism can reach new frontiers of form – or so we’re told. But what happens when the left’s own norms become dominantly rigid?Well, you wind up with the 20 exhibits that the Trump administration now rightly aims to purge from the Smithsonian’s sprawling array of museums, along with many other abuses. Since his inauguration, Trump has worked to rid wokeness from our cultural…