Metal detectors? Sure
Explosive residue sniffers? Yup. They work too. My rocket motor casings sent the alarms off, and it was no big deal explaining it. I like good security that works.
Positively identifying airline travelers before allowing them to board? No-brainer. Agreed.
Guns in the cockpit? No problem here either. They can't possibly shoot someone who can't possibly get in. The new door mods are terrific. I eat crow on that one, I never thought the government would pay for it, and they are indeed tough. Might be a bit of a saftey hazard in a crash because they are... well, that tough. Great mod though.
Records to allow boarding? Yikes. That is scary. If I sold a pound of pot and got busted I couldn't board, but how many of the terrorists that did 9/11 could? I really don't know, but I'm guessing alot of them would have walked on.