And you could theoretically kill 7 million people by shooting each and every one of them in the head with a 9mm pistol bullet. Therefore a store of 9mm ammo is a WMD.
You could theoretically kill 7 million people by slitting their throats with a kitchen knife. Therefore 1 kitchen knife is a WMD...
You can theoreticaly kill 7 million people by pusing each one of them out the window of a sufficenbtly high buildings, thertfore stairs, elevators and windows are are all WMD..
Yea absurdity is fun!
High explosives are not WMD, not in the sense of nuclear, chemical or biological weapons. Anny suggestion otherwise is absurd...