My lesson was cheap... I lost a Mosin spam can opener.
It taught me that I need to keep my luggage clear of "shit" If you don't know what a Mosin spam can opener is...
It's like a 10" piece of metal. I had placed it in between the backpack and shoulder strap.
I had cleared that bag "clear" before loading it but I missed that.
We have had this discussion before and many have lost knives and other items (ammo, etc) Loose ammo is everywhere. In old pants and shirts and coats.
For those that are so outspoken... shit happens.
Just make sure your shit don't stink too much when you get busted.

Of course if you don't fly... then there's no issue for you is there.
I hope we can all learn from this example and prevent others getting cited and/or press by media (no one wants this)...