Yeah, well clearly civilians are worth less to the US than highly trained troops, and there haven't been that many civlian deaths in the scheme of things.
They want to clear the radar and intelligence of the Taliban before they move in, I'm sure. They'll also want air supremacy (by knocking out AA guns, and airfields) so they have more flexibility for dropping special forces into the Northern territories I imagine.
Civilians get killed by ground troops too, unfortunately. :-/