John, do you drive a car?
If you are blazing down the street at 55 MPH and realize there is a problem with the car, do you slow it down to 30MPH to fix the car, or do you pull it over and stop and better analyze it, till you figure out what to do?
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your comment about a "dearth" We can say the EXACT same thing about "a dearth of evidence" regarding shoe bombs, and airplanes. ONE guy out of how many hundreds of millions of passengers a year had a shoe bomb. but now, because of a SINGLE goofball, all Hundreds of Millions of air passengers must take off their shoes.  Why are people fine making hundreds of millions of people comply with some search when only one person in history tried to use it? For that fact, then, there was also the underwear bomber. why are we all not required to take our underwear off and show them to TSA as well?
There have been more killings (accidental or not) and other crimes by illegals, than all of the terrorists committed in the USA.  It's time to RE-evaluate.