Remember what made Hitchens famous - his loud leftism, and what has now made him infamous on the left - his loud criticisms that, at least since 9/11, they have been AWOL during a time when their own most basic principles are under viscious assault.
And no, he doesn't mean Bush's attacks on the constitution, Abu Graib or Guantanamo, which get enough attention from the left. It's the attack by Islam on classically liberal ideas around the globe like self-determination, equality and respect for women, gays, minorities, the irreligious and non-Muslim, etc., etc. Something like a Puritanical Bible thumping Hitler is on the march all over the world in the guise of Islam, and the left is upset instead with Bush.
The Left could not invent a better Boogyman than the radical Islamist and still they don't seem to get that exorcised about him. In Europes and especially England, they are still falling all over themselves worrying about offending the most grotesque, intolerant among them. They are allowing sharia-law within their own societies, and twist themselves into knots over whether or not the public demand for the destruction of England is really a threat, or if such fears is mere "Islamophobia." If they are not Islamophobic over there, they are suicidal.