He needs to be made an example of otherwise everyone could do it and then claim they were just joking.
Planes would be grounded, flights disrupted and cancelled. No business could operate under these conditions. Nip the stupidity in the bud now so I don’t have to spend more time at the airport than I need to in the future.
There are some things that you don’t say at the airport or on a plane. “Bomb” is at the top of the list.