Regardless of the "tools" involved what is frustrating is the lack of logic from the decision makers.
They do not want us to possess a firearm because they do not trust us not to hijack our own aircraft. But they will give us an armoured cockpit door. That makes things nice and easy, I do not need to get involved in a messy shooting - I just wait until he goes to the toilet and lock him out. Now I have complete possession of the aeroplane with no inconvenient body to worry about and no way anybody can get in to interfere with my dastardly plans.
STUPID.STUPID.STUPID.STUPID.STUPID.