Some of this goes back before the 9/11 attacks, of course. The IMF roundup, for example, had more to do with what happened in Seattle in 1999 than with what happened in Manhattan in 2001. But the fact that there's more than one source for the trend does not make it any less alarming.
Fortunately, I don't have to worry about any of that for the next few days, as I and other wedding guests assemble freely on the New England coast. See you next week.