Let's look at the WMD this way for a second.
Let's say a child of 17 had these in his bookbag at school:
receiver, magazine, magazine extension, swivel, swivel retaining ring, receiver shock absorber, carrier latch button, carrier auxiliary latch, carrier latch, carrier latch spring, latch pin, latch pin retaining spring, magazine shell latch, magazine shell, latch spring, cut-off button, cut-off button spring, cut-off button pin, locking block guide, magazine follower, magazine spring, trigger plate assembly, trigger plate pin, cocking slide, breech block slide, gas piston, operating handle, operating handle retaining spring, breech block, locking block, firing pin, firing pin spring, firing pin stop, extractor, extractor plunger, extractor spring, extractor pin, action spring, handguard, handguard front screw, handguard rear screw, handguard screw elastic washer, slide action sleeve, cam , auto/manual fire selector, fire selector frame, fire selector frame pin, fire selector pin, fire selector spring, run piston, barrel assembly, barrel extension, ejector, thread protection bush, protection bush washer, magazine extension retaining spring, selection sleeve valve, sleeve valve friction spring, sleeve valve acting ring, right grip, left grip, grip assembling screw, grip counter screw, pistol grip retaining screw, retaining screw washer, stock fastening drum, stock fastening drum pin, stock fastening drum follower, stock fastening drum follower spring, stock stop pin, stock stop pin spring, stock frame, butt plate, butt plate pivoting pin, butt plate pivoting pin and stock hook circlip, butt plate stop pin, butt plate stop pin spring, butt plate stop pin bush, butt plate stop pin retainer, butt plate shock absorber, stock hook (folding stock version only), stock hook spring, sling, trigger plate, carrier, breech bolt latch, breech bolt latch main pin, breech bolt latch internal pin, breech bolt latch main spring, breech bolt latch auxiliary spring, breech bolt latch spring follower, hand safety, hand safety spring retaining pin, trigger, trigger pin, spacer, trigger lever, trigger lever pin, hammer, hammer pin, hammer spring, hammer spring follower, sear, sear pin, sear spring, auto safety lever, rear trunnion, front trunnion, auto safety spring, auto safety spring guide, trigger guard pin bushing, trigger guard pin detent spring, grip plug, stock fastener, stock fastener washer, and a rear sight.
Now this child also has a guide to assemble a SPAS12. Let's also say a teacher finds this bookbag laying by his desk open, with all the parts just laying in there.
Would you not hope [and expect] the teacher would confiscate this bookbag and turn it into the police? Of course you would, everybody knows these parts make up a SPAS12 shotgun! These are all harmless disassembled, but given enough time the kid will get it all put together. If you were making a case against the child would you not refer to these parts as a SPAS12?
Iraq has the chemicals we gave them, and they aren't cooperating with weapon inspectors, if they had no intentions of using these weapons, and we gave the chemicals to them, why not just say "Hey, the US gave us these to fight Iran, you can have them back now." and show the inspectors where they are? This is enough reason to justify the use of the words WEAPONS OF MASS DESTRUCTION and justify force in getting these chemicals taken back and/or destroyed.