Sure, we're all trying to say something, but it doesn't matter what the author is trying to say, what matters is what you or I or anyone else perceive him to have said. If someone comes up to you and punches you while intending to show you how much he respects you — it doesn't matter that he intended to show respect, it matters what you interpreted his gesture to mean. If you interpret the punch in the face as a gesture of hatred for you, when he intended to show you how much he respected you, would you say that you "misinterpreted" his gesture on the basis of his intentions, or would you hold that your interpretation was valid for you based not on what he intended to say — which is irrelevant — but what he said?
Why only art? Isn't it sort of arbitrary to "this is subjective, but not this"?
Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha....wait, let me catch my breath....Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha.Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha... no, please.....Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha. Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha.....
This is sort of a non-response, but I came to my conclusion on the basis of your seeming lack of understanding of simple things like Barthes' Death of the Author.