One can learn something from everyone. Everyone has a story. For artists, those stories are often told as confessions. Confessions of the past, of the present, of the future. Confessions of reality, and of fantasy.
The value or the quality of a story has little to do with its truthfulness, and much to do with its believability. Vantage point determines perception. Perception determines belief. Belief determines reality.
It is not proof, proof of anything, that artists offer. Proof is highly overrated. Artists place your fingers upon the pulse of their lives, not to prove they are living, but simply that you might feel, feel, from your fingertips to your heart, from your heart to your head, what they feel.