Tismfu,
Your responses were dead on. I didn't see any logical reasons why the procedure should be labeled as "stupid" when it is fairly obvious the few individuals making such claim have no clue how the process works. They don't know how often the password is changed, how it's communicated to the pilots, whether or not each aircraft is given a separate password, when it must be relayed to the control tower, etc. Unless you have that information (and more) then it's premature to comment or dismiss such a process.
No matter what the government does, there are people who will complain. And if the government does nothing, people will complain. You can't please everyone, especially not those who make it their life mission to play devil's advocate. While everyone is in agreement that terrorism can't always be prevented, there are simple things that can be done to make it much more difficult (but not necessarily impossible) for terrorist to accomplish their mission. I don't see how a password requirement to land at the airport of our nation's capital is such a stupid idea? What's stupid is the pilot screwing it up (but we are all human so I wouldn't take it out on him/her either).