Secure Flight Deck
It sure does Skibum - and justifiably so.
The consequences of a suicide hijack are horrendous to say the least.
It it also brings out a lot of hypothetical & bizarre reasons for leaving the flight deck defenceless.
No ground security system is 100% & the terrorists are not to be under estimated in their ingenuity to breach any system.
An armed flight deck gives defence in depth.
Defence in depth makes a hijack most unlikely,as someone has pointed out in a previous thread/post.
Don't fret about the detail , concentrate on the consequences.