"Exchange views with a believer even for a short time, and let us make the assumption that this is a mild and decent believer who does not open the bidding by telling you that your unbelief will endanger your soul and condemn you to hell. It will not be long until you are politely asked how you can possibly know right from wrong. Without holy awe, what is to prevent you from resorting to theft, murder, rape, and perjury? It will sometimes be conceded that non-believers have led ethical lives, and it will also be conceded (as it had better be) that many believers have been responsible for terrible crimes. Nonetheless, the working assumption is that we should have no moral compass if we were not somehow in thrall to an unalterable and unchallengeable celestial dictatorship. What a repulsive idea!"
(From "The Portable Atheist: Essential Readings for the Nonbeliever.")
ADDED: From the NYT obituary:
In a political shift that shocked many of his friends and readers, he cut his ties to The Nation and became an outspoken advocate of the American-led invasion of Iraq in 2003 and a ferocious critic of what he called “Islamofascism.” Although he denied coining the word, he popularized it.
He remained unapologetic about the war. In 2006 he told the British newspaper The Guardian: “There are a lot of people who will not be happy, it seems to me, until I am compelled to write a letter to these comrades in Iraq and say: ‘Look, guys, it’s been real, but I’m going to have to drop you now. The political cost to me is just too high.’ Do I see myself doing this? No, I do not!”