Yup - 9/11 has been used, along with its many other uses, to create fear and sell 'security'.

Follow the money and you will find that the same 'security' profiteers are surprisingly linked to events surrounding 9/11:

http://www.thenewamerican.com/economy/commentary/item/3938-g...

http://en.wikipedia.org/wiki/9/11_Truth_movement

Just look at how easy it is to profit from and sell false 'security' in war-torn Iraq: http://www.theguardian.com/uk/2013/may/02/fake-bomb-detector...