Because the Bushettes lack testicles.
It was perfectly clear that 9-11 was a use of WMD.
The use of ANY WMD is duly recognized as authorization for the attacked country to respond, if they wish, with ANY WMD they happen to desire to test...
...AND, who gives a $#@!. We should have seeded the Trashcanistan croplands with dioxin, Co-60 and Sr-90, and shot anyone attempting to flee.