Hi Blue Jays!
That chain incident reminds me of the fact that even though (almost?) all airliners prevent you to board with even a nailclipper, many provide you with shairp pointy METAL KNIVES in first class!
Like, they reason, terrorists can't pay for 1st class.
Or whoever does catering isn't being payed by the same person that does security. O well, at least they don't allow you to buy tax-free loaded firearms on board.
Yes, that is something I noticed while flying between Austria and Germany...nice serrated steel cutlery! I suppose the good news in all this is that people are eventually growing to understand what represents a threat and what doesn't.
Cheers! 
~ Blue Jays ~