no, not a failure..No planes blown up and No huge Airlines liability..like it or not the politicians who made the law do not have the same expectations we do
That statement is like saying "This antivirus works really well on my computer that's not connected to the internet, I haven't gotten a virus yet!"
If there was a threat, the TSA would probably do a pretty crap job at stopping it, every test that's been run against them shows it, not to even mention the myriad of people that accidentally bring a pistol, knife, or whatever through the checkpoint and discover it when they land!