Americas biased Foreign Policy that runs contrary to International law and its own policies invite such attacks. America could solve many crisis overseas simply by enforcing International Law and therefore gaining full International support. Instead it lets its strings get pulled by treasonous US statesmen and stateswomen who place the interests of other countries ahead of their own.
Taliban attack police HQ in Kunduz (AP)
from the article: The Saudi connection linking the Boston Marathon to September 11