quoted from Jose's post:

What threat?

Serious question - identify the "threat" we are supposed to respond
to,
and put it in context with other similar threats, and then it would
make
sense to talk about possible reactions.

Thank you, this is the heart of the question--the ADIZ creates a buffer
zone that allows civil defense time to characterize the nature and
intent of unidentified aircraft before they can reach a high value
target. But its most serious flaw is that presently, we have no good
way of sorting out incursions due to navigational error or
communications failures from a genuine hostile attack, without
scrambling fighters and evacuating people, which resulted in the fiasco
we saw on the 11th and also the fiasco that resulted when the Kentucky
Governor's plane's transponder failed.

Contributing to the problem is the very planes that are most likely to
cause the problems--light trainers with rudimentary navigation and
dodgy communication equipment, and (arguably) less skillful PIC's--
also present the least viable potential threat. Because the current
technology only allows for a "one size fits all" interdiction policy,
we have the mess we're in currently. If there were a way to determine,
at point of incursion, what the plane is, we could tailor the response,
and avoid the bad publicity and general ignominy we saw with this last
incursion.

Hank