I recall a cartoon. A cave man contemplates something he has just created—the first wheel. By his side, a cave man colleague with skeptical expression says, "If you can't eat it or screw it, what good is it?"
In other cultures, do artists face the question of art's purpose? Or is that one more example of America's proud exceptionalism? The U.S. Petulant and his henchers seem to believe the purpose of art is to irritate them and their co-conspirators, so no more public money for that. Parents fret that their offspring will spring off in an artsy direction—toward poetry or painting or vocal performance or art history—and warn them to study something practical, so they have a fallback. Because everything that isn't good for something else is falling backwards from the American sense of worth.
Ars longa, sed iam stultitia.