It isn't, I don't think, that leftists don't care about the inevitable human costs of a pull out. It's that so many of them live in a world of higher abstracts they mistake for the concrete. They can cry buckets at Starbucks over casualties and atrocities, but these are all subsidiary to ethereal notions like international law, nation-building, conflict resolution, etc. They really have convinced themselves these are "real" things that will protect the Afghans better than NATO forces with guns. That's why Lenin called them useful idiots.
Somebody should do a compilation of Mark Steyn's best lines. My favourite is one he penned just a few days after 9/11 when some of the usual suspects began to play the "it's our fault" game. It went something like this:
"Why do some people feel the full, immediate horror of an innocent secretary and mother incinerated by a photocopy machine, while others see nothing but a vindication of their thesis on Kyoto?"
Good comment Peter.
Re: "You'd see civil war, you'd probably see it for years, you'd see mass deaths, much worse than what what we see now. I couldn't live with that if my country was responsible for letting that happen."
I expect the usual suspects would shrug it off by saying we did our part - writing letters to the editor, urging that Canada "do something" (after ensuring that Canada did nothing", talk about sending in peacekeepers - as if there was a peace to keep.