Right. A reaction primarily to pre-empt or assuage Congressional hand-wringing. And if it perpetuates the Politics of Fear in the minds of the electorate, well that's real good too.

Never mind that by the time any such technology was implemented the bad guys would have moved on to the next methodology. Or softer targets. It would be nice if we could be one step ahead of them, but I'd settle for being even. One (or two) steps behind just doesn't cut it.