How Important Is The Artist To Art?

Once an artist makes a piece of art (a book, a painting, a song, a sculpture, a play, etc.), finishes it and puts it out into the world, what role, good or bad, does the artist play in the work?

Can a good person create bad art? Can a bad person create good art?

How important is the artist to art?

Related questions: What is “good” art? Why do we like what we like? Why does music evoke emotion? How does art influence daily life? What are the benefits of fiction?