There is something wrong here. Primers are normally packaged in little trays designed to keep them from bouncing around. They are NOT packaged loose! It is possible that this guy had emptied several boxes of primers into one container, which makes no sense. A media that gets hysterical at anything to do with guns is of no help, either,
There is definately something wrong here. He took them out of the trays and probably put them into an empty powder can or perhaps an empty bullet box.
This should never be done. Always keep them in the trays. Always.
Another reloader who did not read the instructions. Not that many of them fail to read and understand the instructions, but there are a few.
Sheesh...
Last ones I bought for my black powder pistol were rattling around loose inside a metal container.
I suspect if you carefully set the bag down, just like our very highly paid baggage handlers are wont to do, then have a 70 lb bag unfortunately slip from their hands from a height of 8 or so feet, and land squarely on the a fore mentioned bag, then a enough force might be applied set off a primer or crush a passenger.
It really does not take that much force, something like a light hammer strike, to set an unprotected primer off. If they were in the original crappy cardboard contained like Remington uses then I could see where they would rapidly be randomly scattered through his bag.
I used to load .243 rds with an Original Lee Loader and every few hundred rounds a primer would pop when I was seating it. It is significantly less powerful than even the weakest fire cracker, more like a cap pistol.