Razor blades and box cutters - 4
Unarmed passengers/pilots/crew - 0
Here's an idea (It works just like some of the logic that runs rampant in our own Congress and with some lawyers!)
Let's strap a Kevlar-encased Bomb-vest (filled with just enough explosives to kill the wearer only) onto EVERY PASSENGER that hops aboard an airliner in the US. It will detonate if:
1.) the wearer trys to remove it (fasteners will be on the back - key-activated by pre-boarding personnel only)
2.) the Captain/Head-Crew member determines the wearer is an in-flight risk to the flight itself.
This way, we've handled everything - everyone's guilty - there's no one being innocent - you've been "wired" for the end, just in case it's been determined you don't need to see the end...
We've eliminated all the long lines and invasive searches of the non-guilty party during the pre-boarding and such.
And, if your luggage has anything weird in it - you have only a few minutes to get out of line and explain yourself - or....
And, if you're alive at the end of the flight, you get to collect your luggage. (Provided it got onto the same flight w/you!)
No need to arm the pilots, they have the key to "end" any crisis before it gets too wierd!!
"Let's not punish the evil-doer...let's make everyone "responsible" for everyone's else's safety."