Glad no one was hurt. It's a no-win situation. They have to respond to bomb threats or the relatives of the passengers will be peeved if there were to be a bomb on the plane.
Even though 99.99999% likely it is a hoax, they still have to follow through because current air security is just not reliable enough to chalk it off as a hoax.
Our TSA dollars could be much better spent on inspecting cargo.