In some instances, assisting in building a stable government is the best thing. Take Iraq, for example. Under Saddam, they had a stable government - regardless of what anyone thought of that government. We destablized it and it was our job at that point to stablize it. Our mistake, of course, was trying to install another puppet regime there. But we still should have helped structure a new government and provided security while that was happening - IMO.
I see Afghanistan the same way. In 2002, leading up to the Iraq war, Al Gore said:
The events of the last 85 years provide ample evidence that our approach to winning the peace that follows war is almost as important as winning the war itself. The absence of enlightened nation building after World War I led directly to the conditions which made Germany vulnerable to fascism and the rise to Adolph Hitler and made all of Europe vulnerable to his evil designs. By contrast the enlightened vision embodied in the Marshall plan, NATO, and the other nation building efforts in the aftermath of World War II led directly to the conditions that fostered prosperity and peace for most the years since this city gave birth to the United Nations.
Two decades ago, when the Soviet Union claimed the right to launch a pre-emptive war in Afghanistan, we properly encouraged and then supported the resistance movement which, a decade later, succeeded in defeating the Soviet Army’s efforts. Unfortunately, when the Russians left, we abandoned the Afghans and the lack of any coherent nation building program led directly to the conditions which fostered Al Qaeda terrorist bases and Osama Bin Laden’s plotting against the World Trade Center. Incredibly, after defeating the Taliban rather easily, and despite pledges from President Bush that we would never again abandon Afghanistan we have done precisely that. And now the Taliban and Al Qaeda are quickly moving back to take up residence there again.
Later in that speech, he mentioned what should have been a priority for Bush in seeking authorization to invade Iraq from Congress:
The resolution should also require commitments from the President that action in Iraq will not be permitted to distract from continuing and improving work to reconstruct Afghanistan, an that the United States will commit to stay the course for the reconstruction of Iraq.
So I guess the level of nation building will be debated now.