War is a big business in the USA; in fact is is the USA's biggest business -- more than 50% of the US economy is devoted to it. Without war, the US economy would wither -- which is why the CIA travels the world creating wars for the USA to fight, or for the US war industries to sell arms to the combatants.
     The USA encouraged and armed both sides during the Iran/Iraq War of the 1980s, one of the deadliest wars of the 20th Century, in which more than a million people died. From the Iran/Iraq War the US arms industry made big profits, the CIA made big profits by illegally smuggling arms and drugs, and both Iran and Iraq were badly weakened, which later helped with the US invasion of Iraq for its oil. 
     War is a business, and the chief business of the USA is war. That's why the CIA works hard at spreading Terrorism around the world. Given the dependence of Pakistan on US aid, if the USA had actually and seriously opposed it, there would have been no Terrorist training camps supported by the ISI and the Pakistani military within Pakistan. 
     It is a matter of public record that the former head of Pakistan's ISI, General Mahmoud Ahmad, sent $100,000 prior to the 9/11 attacks to the alleged 'chief highjacker', Mohammed Atta. General Ahmad was also in Washington DC during the week prior to the 9/11 attacks, meeting with his US counterparts at the CIA and the Pentagon.
     'Terrorism' is mostly a product of unscrupulous governments such as the USA and its allies.  -- GF

"Pakistan's chief spy Lt. General Mahmoud Ahmad "was in the US when the attacks occurred." He arrived in the US on the 4th of September, a full week before the attacks. He had meetings at the State Department "after" the attacks on the WTC. But he also had "a regular visit of consultations" with his US counterparts at the CIA and the Pentagon during the week prior to September 11.

What was the nature of these routine "pre-September 11 consultations"? Were they in any way related to the subsequent "post-September 11 consultations" pertaining to Pakistan's decision to cooperate with Washington. Was the planning of war being discussed between Pakistani and US officials?

On the 9th of September while General Ahmad was in the US, the leader of the Northern Alliance Commander Ahmad Shah Masood was assassinated. The Northern Alliance had informed the Bush Administration that the ISI was allegedly implicated in the assassination.

The Bush Administration consciously took the decision in "the post September 11 consultations" with Lt. General Mahmoud Ahmad to directly "cooperate" with Pakistan's military intelligence (ISI) despite its links to Osama bin Laden and the Taliban and its alleged role in the assassination of Commander Masood, which coincidentally occurred two days before the terrorist attacks.

Meanwhile, senior Pentagon and State Department officials had been rushed to Islamabad to put the finishing touches on America's war plans. And on the Sunday prior to the onslaught of the bombing of major cities in Afghanistan (October 7th), Lt. General Mahmoud Ahmad was sacked from his position as head of the ISI in what was described as a routine "reshuffling."

In the days following General Ahmad's dismissal, a report published in the Times of India, revealed the links between Pakistan's Chief spy Lt. General Mahmoud Ahmad and the presumed "ring leader" of the WTC attacks Mohamed Atta."

Link:

http://www.globalresearch.ca/articles/CHO111A.html