Deconstruction is indeed mature: It's just that 90% of those who do it have no idea what they're actuall doing.
To be fair, the same can be said with most of what I said "wasn't mature." I also stand by my "superficially mature" comment. Putting something that's deconstructionist in your story doesn't automatically make it mature, any more than gore or nudity or swearing or etc automatically makes anything mature. What makes something mature is more tone and treatment than content.