As I mentioned, personally I support armed good guys on board, ideally with non-lethal ( ie non-fuselage / other people puncturing ) weapons or the real thing.
I suspect airport security will always be a joke, inconveniencing people like say, the pilots and legitimate passsengers, while the bad guys will always find a way - for a start have a look at the typical catering re-packers, who prepares that 'food' etc, etc...
I was rather hoping for armed good guys rather higher trained ( ex-S.F. ? ) than the armed plod we see - shooting a naked man in his bedroom, a chap carrying a bit of wood in his carrier bag, or indeed the famous
" I bet you I could jump that turnstyle " incident...
So, armed 'sky marshalls' yes, but only highly trained & with the most suitable kit possible.