9/11 was caused by:
1.) America's entanglement with Saudia Arabia
2.) Non-enforcement of Immigration Laws when the hijackers' visas expired
3.) Failure of Bill Clinton to put more screws to bin Ladin, Al Queda, the Taliban, Saudia Arabia, the United Arab Emirates, and Pakistan after numerous attacks against Americans overseas.
4.) Lack of integration of foreign intelligence with domestic law enforcement.
5.) Resistance to the imposition of Western values upon the peoples of the Middle East
9/11 occurred when USAID was fully funded.
American taxpayer dollars should be prioritized towards domestic American investment in infrastructure, defense, and R&D.
Bringing food, healthcare, agricultural, and educational assistance to poor nations that want us there is a worthy soft diplomactic endeavor.
American foreign aid should be used to give poorer nations a hand-up, and not a hand-out.
Building a sex change clinic in Mecca, and other liberal nonsense, is counter-productive. Not every nation of the world wants to be San Francisco, nor should America insist upon it.