McCain's crazy talk and flip-flops on Gitmo

McCain: Gitmo is ‘one of the nicest places in the world to live in.’

During a question-and-answer session with Walter Isaacson today, Sen. John McCain said Guantanamo Bay is “one of the nicest places in the world to live in.” Later in the interview, McCain was asked about the Supreme Court’s recent decision in Boumediene v. Bush declaring that Gitmo detainees have a right to challenge their detention in civilian court. McCain had previously derided that decision as “one of the worst decisions in the history of this country,” but today stepped back from that comment:

ISAACSON: But you called that the worst decision in history?

MCCAIN: No I didn’t. No, no– Sometimes I’m given to a little hyperbole.

In 2003, McCain said, “A serious process must be established in the very near term either to formally treat and process the detainees as war criminals or to return them to their countries for appropriate judicial action.”

(Think Progress)
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Can we trust anything that McCain says? He tries to deny everything he's ever said and when he is caught, he just claims that he didn't mean it. What should we believe from him?