One of the dumbest parts to me is it was a syringe of liquid. Its the smallest possible dispenser they could come up with. Not a water bottle, cup, jar, or anything with a meaningful volume. Hell, a bright orange squirt gun would have had a more "terrorist" feel.
"Life is tough but it's tougher if you're stupid." John Wayne in The Sands of Iwo Jima. He must have been thinking of libturds.