"I saw it suggested that the "Bush Lied No WMD" crapola was sufficient for the terrorists - that they knew if they actually used WMDs then their pro-terrorist sympathizers in the Democratic party would no longer give them free propaganda. That, essentially, NOT USING the WMD's meant free anti-war spin and that was more useful for them than the few thousand deaths they could gain by using, say, a dozen sarin rounds in the Bay Area Rapid Transit system."
Rick at The Real Ugly American has an update with an explanation of the reason the Bush administration kept this quiet:
General Tom Mcinerney is reporting on Fox Hannity and Colmes right now that that the administration has been keeping this low profile to avoid exposing 3 of the 5 members of the UN Security council; Russia, China, and France. McInerney says these weapons will be traced to these countries, and asserts it is well known that Russia helped Saddam move most of his WMD stockpiles out of Iraq before the war.
http://therealuglyamerican.com/2006/06/21/wmd-found-in-iraq/