It's not JUST humanitarian intervention though, it never is. It's incorporation into the expanding capitalist empire through the installation of client regimes at great cost to the people of those countries. It's imperialism. That's why I have trouble labeling Kouchner a leftist or a socialist (though I know little about his other politics -- Doctors w/o Frontiers) -- he is supporting capitalist empire, he's on board with Sarkozy's dive into French neoimperialism as foreign minister. Maybe he says he's leftist but he is not showing it.
Anyway, it's just labels. Useful as shorthand, perhaps, but otherwise they say more about the person using those labels. Cohen supports George W. Bush, and is a confessed fan of Paul Wolfowitz, quivering with ecstacy to be in the presence of such power. It's hilarious to me that he criticized Blair endlessly for being all image while trusting and supporting (even now) one of the lying-est most cheating-est, least transparent U.S. regimes ever. He is interesting to me only in that he symbolizes a certain wedge going on in the left, where capitalist co-optations of left rhetoric like identity politics and tolerance trump traditional leftist issues like class and imperialism. He is uninteresting to me as an actual politico because he is ludicrously black-and-white: once he picks a side he doesn't deviate, even now refusing to condemn British and U.S. abuses -- indeed, he accuses everyone else of deviating BUT him!