"We are so wide open it is beyond belief and it is impossible to protect us. We cannot fix this on our side."
I agree. It is only a matter of time before they will succeed in an attack (biological, chemical, or nuclear in nature). So I think it's wise for us to prepare mentally for that time. I'm not saying let's all go hide in our basements, but simply live our lives recognizing that it could all change drastically any day. I think such preparation will help us to think rationally when the day comes.
As for your scenarios...I am most concerned with large sporting events, especially when they are happening simultaneously. Take the NFL games this Sunday, just before the end of Ramadan. At 1pm there will be games at the Meadowlands, Cincinnati, Buffalo, Miami, Tampa, Atlanta, and Kansas City. A coordinated attack at a few of these venues could start a panic and stampede at all of them. I don't think we can really say how people would react.
FBI is watching YOU!
Whoa dude!
Oh boy. Tell us how your interviews with the FBI and Homeland Security go.