Believing that the neocons might have got it right about the need to confront radical Islam doesn't automatically turn you into a conservative. Nor does supporting the 'right' policy even if you believe it's being pursued by the 'wrong' side. I don't recall Hitchens suddenly coming out in favour of school prayer and tax cuts for the rich. I'm sure he would argue that it's the left that has changed, not him, and I think he'd probably be right (see this post). Falling into the trap of describing Hitchens, or Berman, or Cohen as former leftists is doing the devil's (or Seumas Milne's) work for him.