LOL. There's already a thread about this.
Why is it disgusting that it was mistaken for a bomb?
USA doesn't mess around with security. That is common knowledge.
Once they suspect something could be a threat, they act accordingly.
Even if it is something as small as a pencil case or in this case, a handmade clock, they act accordingly.
Are they paranoid? Perhaps
Would they rather be paranoid than have parents mourning the lives of their children? Definitely