I think that good conceptual art is about the interactions among the idea, the work and its participants as much as anything else. That includes people trying to poke holes in an interpretation, and its defenders trying to weasel out of it. There's nothing wrong with that - at its most stripped down, the purpose of a conceptual work is to just be a conversation piece.

Or to put it more succinctly: Oftentimes art's biggest enemy is people making it out to be a bigger deal than it really is.