Even ignoring the fact that you are just begging for a "correlation is not causation" lecture, when was the last time you heard about a successfully thwarted attempt? You offer lack of evidence to the contrary as proof, which is utterly absurd.
I didn't offer ANYTHING as proof; in fact, I didn't even argue the OP's point. What I DID do was question how anyone could possibly come up with his conclusion. He DIDN'T say "the end doesn't justify the means," he said "I don't like the means, and I claim the end is a failure even though nothing has happened."
I've never had someone do a full body X-ray when entering a concert or sporting event, nor have I been frisked.
Wonderful. I've never had someone do a full body X-ray at an airport, and you apparently don't go to any sporting events or concerts.
(which, due to changes in cockpit door construction, can no longer feasibly be used to do great harm unless the terrorist has a pilot's license)
http://www.secure-skies.org/fortifieddoors.php
that you think requires so much less personal freedom than any other location
What do you do when there is increased risk? You mitigate it.
comparable number of people
I'm not sure how you're figuring "comparable number of people." Unless someone is sneaking a nuclear fission weapon in to a football game, they aren't going to hurt nearly as many people as, say.. oh, you remember... that airplane thing with the World Trade Center. Whatever.
The TSA is likely made up of your standard government agency moron just like all the rest of them. But complaining that you can't bring your printer cartridges, and acting like no more wifi on planes is the end of the world is just plain stupid. In review: a guy made a bomb out of a printer cartridge. What would YOU do?