I was going to do this as part of the "Wackiest conspiracy theories" thread, but I thought I'd start a new one.
It seems to me that, in considering all these conspiracy theories, the question we need to ask is: which is the more likely? Which sounds the more plausible? Let's take, as an obvious example, 9/11.
The choices seem, basically, to be the "Official" version, and various theories that either George W. Bush and the U.S. Government either organsied it themselves, or allowed it to happen. The "Official" version is that it was organised and carried out entirely by a terrorist network, known as Al Qaeda, masterminded by one Osama bin Laden, who was throughout the planning and execution of it, in a cave of Afghanistan, courtesy of his friends the Taliban, and was carried out by a small group of terrorists who had received rudimentary flying training at a flying school in Florida, which gave them sufficient skills to take over control of Boeing 757s and 767s, and fly them into the World Trade Center and the Pentagon, and also (perhaps), the White House, if they hadn't been overpowered by the passengers. The "alternative" versions seem to range in complexity from simply that Bush and/or some in his adminstration and/or the CIA knew that an attack, by Al Qaeda, was being planned, and that they allowed it to happen, thereby providing justification for the war against Saddam Hussein's Iraq which they had been planning ever since Bush decided to run for office, for reasons primarily concerned with securing control over Iraq's oil reserves, but also because of the dynastic feud between the Bush family and Saddam, to the most elaborate version, that the entire attack, from beginning to end, was planned and carried out by the Bush administration, and consequently they deliberately murdered thousands of their own citizens, to pursue the ends outlined above, and of course to give them unlimited power over the population.
In the search for which seems the most plausible, let's consider some of the pros and cons of the official and the conspiracy theories.
Official version: Bin Laden was a known, and very public, opponent of the west (i.e. the United States), and was on record as stating publicly on several occasions that he regarded the US as the enemy of Islam, and preached holy war against the west.
Al Qaeda had, indeed, previously planned attacks against targets in the US, and has subsequently carried out attacks in Bali, Madrid and London, all aimed at allies of the US.
The flying skills necessary would be just enough to take control of the aircraft, and steer them into the desired target visually; they wouldn't need to worry about navigation, takeoff or landing, etc.
Bin Laden claimed responsibility, publicly, and has always taken the "credit" ever since.
Against the official version: Bin Laden was a sick man, who, indeed, has been widely rumoured to actually be dead, on more than one occasion. He is supposed to have planned and coordinated this whole operation, with its pinpoint planning and timing, from a cave in the Tora Bora mountains, with the aid of a satellite phone and laptop.
The Twin Towers may have been tall, but that didn't mean that they were necessarily an easy target to fly in to; to deviate from the flight path, aim for those specific buildings in the heart of one of the largest cities on earth, and hit them precisely at the angle and speed necessary to destroy them, was something that arguably would have needed rather more practice than a few hours behind the wheel of a Cessna. And the Pentagon was an even more difficult target.
Discrepancies in the passenger lists of one or more of the flights.
The "very convenient" finding of the passport of one of the alleged hijackers among all the wreckage, from the actual pocket of one who was in the cockpit of one of the planes that exploded into a fireball.
Bin Laden (assuming he was still alive, and it wasn't an imposter) would have naturally claimed credit, as it would have massively increased his esteem in the eyes of the radical Islamic community.
Problems with The conspiracy theories: To, not even allow an attack on your own people to happen, but to actually do it yourself, is in a completely different league from anything that's ever been done by any other tyrant in recorded history; the most obvious parallel is with the Reichstag, but no one was actulally killed in the Reichstag. Was Bush, then, on a level of evil so far above any of the most evil men in history? There are documented cases where US presidents have planned or done things to their own people, like Operation Northwoods, say, but this is on a different plane altogether. The plans considered under Northwoods ( http://en.wikipedia.org/wiki/Operation_Northwoods ) included such things as staging attacks on US ships or "real or simulated" sinking of Cuban refugees, or "Harassment of civil air, attacks on surface shipping and destruction of US military drone aircraft by MIG type planes", but even these just considered "staged" attacks, or attacks on drones, or "harassment" of civil aircraft; a completley different league from deliberately killing thousands.
And then there's the sheer scale of the most elaborate options; switching of planes with ones the CIA had secretly prepared earlier, clandestinely disposing of the actual planes and their passengers, planting explosives in the WTC to coincide with the planes hitting; and the sheer numbers of people who must have been involved. Have any of them come forward to say that they were involved at some stage of the plot?
All this is just an endeavour to consider, which is the more likely? The official version, the most elaborate conspiracy theories, or something in between? That they knew that something was planned, but, not realising what form it would take and what would be the result, allowed it to happen and so give themselves the justification they desired for the war they wanted, but when it did happen, never imagined for a moment that this might be the form it woudl take (remember GW's face when he heard about it? And the flying around like a headless chicken afterwards?) If it had been planned so that he could lead his country into war, wouldn't he have stood up straight away and done the rousing Churchillian thing, rather than giving every impression of a leader who is panicking? Was it all an incredibly subtle act, to give the impression that he hadn't been expecting it? Is Bush, in short, the most evil man who has lived since Stalin and Hitler?
Just a few thoughts.
