Do you really think that there is no insight to be gleaned from art?
Every now and again, you get a movie like The Matrix, that's both entertaining and thought provoking. Those are entertainment unicorns, as evidenced by the sequels that had nothing thought provoking left, but were still somewhat entertaining.
When it comes to art - if you knew how much shit art gets made and never sees the light of day, you could argue entertainment and art are both equally devoid of almost any value, including insight, to anyone.