One thing that is useful when trying to understand such a complex topic, is to head right to the top of the system, to the root. I understand why some people feel this is a Jewish attack, but if we zoom out further it's more that Israelis (Religious Jews, Ethnic Jews and Atheist Jews) were convenient to use for this job, if any other nation had been more suited then they would have been picked instead.
At the top of the Western system is The House of Rothschild and the British Crown. The USA is a corporation that belongs to them, they use it as a giant war machine (The Special Relationship). The Rothschilds fund The Rockefellers, who were originally used to control oil (Standard Oil), during WWII they were used to fund the Nazis and today they are in control of the United Nations and CFR (and a lot more too). Israel is a country that was setup by and belongs to the House of Rothschild. The 9/11 attacks would not happen without the go ahead of the House of Rothschild. They would delegate control of the project.
A decision was made at the top to expand the Western controlled empire. They had to mobilize their War Machine (the USA); increase military tax spending, get people behind the war etc. This was the purpose of 9/11; a catalyst to oil the wheels of war. Who to use to set it up? Americans not so good i.e. loyalty. British not so good either, it would be hard to convince them they are helping the future of their country. Ideally one wants English speaking who will fit in in the US, and they should be people who you can convince that they're doing something to help their country. This is why Israelis were used, but it was the people at the top who made that decision, they could have chosen various other nationalities if they had wished.
