Look, if were for any sinister reason they wouldn't be buying the stuff. They'd be making it in their secret underground facilities in.................I gotta go, someone's at the door.
Dude, it's the Dominoes guy! Wait I didn't order a pizza...uh when did the Dominoes guy start driving a black SUV and wearing a black suit...and a badge....oh fuck me.
And just to make our paranoids a little more paranoid:
1) If this is waiting they're publicly buying, imagine the stockpile behind the scenes.
2) If they wanted to really do it secretly, they do it and we'd not know it. They fact that it's public means they know there's nothing to stop them.