Originally I thought that you could turnover a few stones, (that Bush was intentionally not looking under) and the conspiracy and the actors would be revealed.
The 19 were helped by direct actions of people in the U. S. Government.
These direct actions have been called mistakes and/or coincidences.
Originally I thought that any influence used to intentionally degrade U. S. Intelligence and Defense would be overt and easy to spot. But a lot of the people it seems to be leading to, are not in that many of the “Truther” databases. Some of them are just names, no clues about what they are, or where they came from.
CIA personnel have cover stories, they actually have some truth in them, or the cover story wouldn't work.
Other members of the conspiracy, (some completely unrelated to 9-11) have peculiar indicators. Their Wikipedia entries have either information minimized or completely missing.
Too many of the people involved, if they were questioned at all, got a slow softball across the plate. Some have literally disappeared into the machine. Some parts of the government are so secret that it is very difficult or nearly impossible for someone like the FBI to get any picture of what is happening on the inside.
These direct actions have been called mistakes and/or coincidences are key to unraveling the conspiracy, if it exists.
Often the Bush Administration would pull out all of their dirty tricks and foot dragging, when they were going after whistle-blowers. Those people created a lot of public trails that could be followed, usually backtracking to some right wing think tank in the present time.
If anyone knew about 9-11 in the U.S. Government, they don't seem to have learned it from the U.S. Government. And Israel is not as much of an obvious choice as I originally thought it to be. They would have not been this clumsy, unless their tradecraft is in serious decline.
Obvious, provides emotional certainty, if a conspiracy exists, then understanding it/(or not it) is a challenge.
This is not multiple choice, this is a thesis.