After reading the website, I am actually more convinced that US didn't plan 9/11. My originial argument is this; most logical people will not steal a bread when the penalty of stealing is death. Exactly what US could have gained if 9/11 happened? Only tangible thing US govt would have gotten is a boost from the people in US, and maybe a second presidency for the Bush. Actually, this also could have gone either way too, because if he handles the situation wrong, he would definitely fail to serve 2nd term. Just because 9/11 happened, US wouldn't gain oil automatically, and there are too many uncertainty that could have gone anywhere. In other hand, have you imagine the aftershock if US get caught in the future? Bush will be in a jail for long time for murder and treason if not being executed, US will be distrusted instantly, and that will bring gigantic chaos and worldwide economic depresson for a long time. Knowing tiny plus side and catastropic minus side, I don't think any sane people will choose to go ahead with 9/11.
The website said how people suddenly applied for insurance, exercised stock options, people canceled flight plans and how some people received a tip by phone calls. If you are planning something that the wrong turn can devestrate yourself, you will keep the secret till the last mins, instead of telling basically everybody that something will happen so they need to do something. I mean, would you tip somebody to exercise mere 1.7 mils stock option, when keeping the secret is extremely important? And, the death of popular people would have made 9/11 more dramatic. While W. Brown is a popular politician, his death will not shake the security of nation. If any, his death would have been used as a flavor for the future use. Those are actions that people would not take, if they ever plan to keep the secret.
So, did US know about 9/11 but let it happen? I also doubt it either, because US was just unprepared. If there is any reason for 9/11, it has to be because of oil. However, there wasn't much connection with Al Qaeda and Iraq, and that's why US attacked Afghanistan first. Then, when US tried to attack Iraq, they said Iraq are building weapons of mass destructions, which they couldn't find a trace of it in Iraq later. US looked like a complete fool after invading Iraq, and later US said they attacked Iraq to free people, which nobody bought. If I knew 9/11 would have happened and tried to use it as an advantage, I would have made a plan much smoother. I would have found a way to connect Al Qaeda and Iraq somehow or put some evidence of WMD. Or, at least avoiding invading Iraq or create a better reason to invade Iraq, so that I won't look like a complete fool at the end. US didn't even have a wit or intelligent to put some 'evidence' to make people believe that Iraq was creating WMD. I seriously doubt that they knew exactly what would have happened and tried to take an advantage in 9/11...