As he said in the article, if they HAD stopped someone, that someone would have been charged with a crime. Where are the charges?
The problem is that the TSA is not responsible for any of them. Either they were discovered and apprehended before carrying out the act by intelligence agencies (that predate the TSA and DHS, and have been doing this for a long, long time), or they were stopped by passengers and bystanders, in which case the TSA has demonstrably already failed.
Either way the DHS is just an embarrassment.
It's really not any better than the argument that of course the TSA keeps away terrorists and tigers because there haven't been any hijackings or tiger maulings on airplanes since they took over.
It clearly works, too! I've been using it for decades, as have many of my customers, and wouldn't you know it! None of them have ever been attacked by a Rhino.
$60b a pack.
[Later, a full-force Bear Patrol is on watch. Homer watches proudly.]
Homer: Not a bear in sight. The Bear Patrol must be working like a
charm.
Lisa: That's spacious reasoning, Dad.
Homer: Thank you, dear.
Lisa: By your logic I could claim that this rock keeps tigers away.
Homer: Oh, how does it work?
Lisa: It doesn't work.
Homer: Uh-huh.
Lisa: It's just a stupid rock.
Homer: Uh-huh.
Lisa: But I don't see any tigers around, do you?
[Homer thinks of this, then pulls out some money]
Homer: Lisa, I want to buy your rock.
[Lisa refuses at first, then takes the exchange]