Because conflating the ozone hole with global warming (two different and unrelated phenomenon) can be a legitimate product of confusion, but it's more commonly a denialist tactic on a par with "if evolution is real, why are there still monkeys?" See enough of it, you get uncharitable.
http://www.ucsusa.org/global_warming/science_and_impacts/sci...
Because the mechanism behind the melting is already explained in The Fine Article.
Best solution? Don't call someone's question ignorant or stupid. Instead, be a decent human being and help alleviate the confusion by answering the question.
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Because all science operates on the principle that theories are subject to reinterpretation upon new evidence, all science except climate change, whose dogma is not to be questioned.
As to the relation of the subjects, I have seem many of the AGW defenders to claim that CFC, HFC and all the other gazes they claim is harmful to the "ozone" also are "greenhouse gases", which as I said before is a complete stupidity.
(edit: wtf? why would anyone downvote this? it's a legit and perfectly fair question.)