It is not the arming but the disarming of the Afghan population after the Soviets left that caused a vacuum for terrorism of foreign fighters to get in there.
The UN disarmament and the lack of help for General Massood was what precipitated 911 later on, along with Clinton policy of budget cuts and refusing to heed repetitive offers by Sudan to have Bin Laden handed over.
At the same time Clinton voted for the arms embargo in Yougoslavia leading to the massacre of Croates at the hands of Serbs.
The original essay is an incoherent attempt to push a bunch of conservatives' buttons and hope for a "Hell yeah!"
My response is just: WTF?