Memory is fallible. Blog posts are reliable, at least recording the moment.
IIRC when GWB sent our forces into Afghanistan I was dubious, remembering the British and the Soviet failures. Had I been blogging then I might have recorded that opinion, which I could now point proudly to as proof of my prescience.
Of course, had I been blogging a few months later I might have posted my opinion that our easy success in Afghanistan showed we might have learned our lessons from the past and our new technology with precision bombs would enable us to oust Saddam. I think that's my memory, though I also think I was still queasy about invading Iraq.
We'll never know.