If your art needs an explanatory statement, then you fail at art. A painting, or a movie, or a story that does not say clearly everything that it intends to say, is not artistically solid. If you have something to say about your art, then you should be saying it in your art, and if you cannot do so, then that is your artistic failure, not the fault of the audience for being unable to interpret your art on its own.
That's just how I feel about it. An artistic statement seems to say, alongside the art to which it connects, "I tried to say all this, but it didn't quite come out properly, so here's the missing bit".
Mokalus of Borg
PS - So, what I was trying to say here was...
PPS - Oh, dang it.