With bin Laden gone, get out of Afghanistan

Officially, the US invaded Afghanistan because the Taliban refused to turn over bin Laden (as though he was even there...and as though they could have captured him). It was simply a strike at the most available target to appease an angry US citizenry. Well, now we're mired there as well as Iraq. We started both wars, needlessly and under false pretenses. There's an incredible drain on our resources, human and financial. Let's just get out of both wars right now. We don't have the understanding or the ability required to rebuild those nations in our own likeness. Let's just call it all off now that we have an excuse to do so. Don't we ever learn anything?