This is not the first time we have heard this "news". The last time I heard about it, it was a broader story. US military were bemused by the weak efforts in the initial attacks in Afghanistan, and said it was contrary to good military procedure. It wasn't just bin Laden they failed to capture, but the Taliban, who were also easier targets at that point. Members of the US military said that the US failed to act sufficiently in the initial weeks, and that's why we're all still there - that essentially, they lost the war in the first month.
I'm not generally a conspiracy theorist, but I have to think there's a possibility that this was deliberate - that the Bush government wanted a long occupation of Afghanistan and wanted a prolonged war on terror. I don't know why they would want that: ...to further enrich their friends at Haliburton? ...to reap the political benefits of being at war? ...as part of an expansionist agenda in the middle east? ...or, and I'm not as sure about this one, to build a pipeline? All that happened, so it's not too wild to assert it was deliberate.
And why are we still there?