"No one denies that wine left open indefinitely will spoil. However,
you're
the only person I've ever seen or read suggesting that all wines are
spoilt
by decantation. So do us all a favour and drop this attention seeking
nonsense, Michael.

Ian Hoare"

It's not nonsense. Try it yourself. Get two bottles of the same Italian
red wine. Open one up and let it sit open for 3 hours. Then open
another and pour immediately. Make sure you can't tell which is which.
(Have someone do it for you, maybe.)