Can Australia save America from itself?

Hugh White's last two posts strike me as pretty convincing arguments for Australia to pull out of Afghanistan. Yet as I understand Hugh's position, he thinks our current commitment to Afghanistan is about right. He thinks Australia is doing just enough to 'pay its dues' with the Americans yet not so much that Australia puts too many lives in danger and commits too many resources to a conflict that is peripheral to our interests.

I agree that the only really important strategic interest at stake for Australia in this war is the alliance, but it does not follow that the best way to serve the alliance is to go along with the Americans. We could, instead, try to convince the US that they are on the wrong course — a pull-out would be a pretty dramatic demonstration of that point of view.

So my question is, is it ever wise for Australia to try to save the US from a strategic error rather than following them into one?

Photo by Flickr user El Fotopakismo, used under a Creative Commons license.