For something serious, sure... For 1 cartridge, it's the law run-a-muck. Hope it never happens to you
One round on a plane IS a serious matter. how hard would it be to have the ability to set that ONE round off into some vital part of the plane after it is at cruising altitude and kill 200+ people?
And as for your hope that it never happens to me,Ii would put my paycheck on the fact it never will. I completely "sanitize" my luggage before packing, even for a road trip. Truthfully, my range bag is something that only travels to the range with me, it stays packed with the same items year round, (I add some patches now and then) and never goes on a road trip, or to an airport. Last summer before picking up my stepchildren from the airport, I even "sanitized" my vehicle and found a pocket knife my oldest was hiding from me that was supposed to be a birthday present.
The fact of the matter is, when you choose to fly, you have to be responsible to make sure that your luggage, whether it is a carry on like the gentleman had, or your checked baggage is free from contraband such as ammunition, knives, bombs, and that it stays in your possession from the time it is packed until the time it rolls down the conveyor to get on the plane.
I would venture to say that on the right day, with the right flight, the same man would be sitting in a U.S. holding cell somewhere for the same reason. I still say let him sit, even if they drop charges it will teach him some much needed responsibility.
We don't have to like the laws of another country, but we do have to follow them. Just like the state to state laws on transporting or carrying open or concealed weapons.