I thoroughly believe in the "Cowboy Mentality" among Americans and those not wanting to be killed in a Hijack. Which makes the Separated Cockpit even better of an idea. The only thing the pilot should ever have to worry about is flying/landing the plane. A door gives to many chances for someone to get to the pilot or (even worse) for the the pilot to join in on the Terrorist Stomping.
There's the real danger; having no one flying the plane because everyone was too busy kicking ass.