Israeli Pullout Delayed

Just read this article from Yahoo News, which seems to imply that it's a bad things that Israel may take an extra couple days before completely pulling out of Lebanon. What I don't understand is why Hizbollah isn't having to make huge excuses for not yet returning the soldiers that they kidnapped months ago. When are these kids coming home? And why on earth is Israel retreating without getting their objectives met? I just don't get it.