I agree.
None of the sources I've seen so far are that solid. I'm watching DoD sites. Still, if it keeps people's antenna up, it's probably useful, although panic is not necessary.
I'm still totally amazed we haven't been hit by now, particularly by something along the lines of what we saw in England and Spain. This would be so damn easy to do, it's ridiculous. Particularly attack methods that would involve no explosives or unusual behaviors.
I have theories on why this is so, but they aren't consistent with each other, and I've got nothing to back them up.