And really, what's the point of NOT declaring it?
If you read what I have written, from the top, this is my precise point. It's such an easy thing to do that nobody should not do it based on any reason they can dream up with.
Most of your other points have nothing to do with the thread subject. CCW? Nobody is discussing CCW.
The external tag on a bag was old school, and I still have one from when I used to carry my .45 in checked baggage. "Contains Firearm" on a hang tag on the outside of the bag... might as well have said "steal me"... however I never lost anything.