Conversation so far:
What did Hekmatyar do after 9/11?
Hekmatyar rejected the U.N.-brokered accord of 5 December 2001.
Was he connected to Bin Laden?
Hekmatyar released a taped message calling for jihad against the United States.

Question: Why did he do this?
Self-contained rewrite: Why did Gulbuddin Hekmatyar call for jihad against the United States?