That's a good post and I'm not trying to be argumentative.
I see the left raise the bar time and time again and we (Republicans) fall for it.
Since the day after 9/11, the president said we would go after, in various ways, those who harbor, fund and work with the terrorists.
We know that Iraq harbored and worked with AQ. That IS rock solid evidence.
So now the left has raised the bar that we have to have evidence that Iraq worked with AQ to conduct the 9/11 attacks. There is circumstantial evidence to support that Iraq did help out, but you are correct, it is only circumstantial evidence.
We have to be patient.
God has His own timetable.