So now you are allowed to carry a knife on board an airplane. Yes, the TSA announced that if your knife’s blade is no longer than 2.36 inches, you will be allowed through security and onto the plane.

You must leave your 10-ounce tube of toothpaste behind. And your 6-ounce bottle of shampoo. And your bottle of water. Because you might be a terrorist. And terrorists can bring down planes with toothpaste. Or with whatever they filled the tube with. (They must be really, really clever if they managed to put anything back into a toothpaste tube.)

There is apparently no Logic Office at the TSA. Clearly a terrorist can do a lot of damage with a blade 2.36 inches long. As much damage as the 9/11 baboons did with the much shorter blades of box cutters. If the TSA fears terrorists, allowing them such blades makes no sense.

Nor do the bans on stuff like toothpaste and shampoo. The TSA worries that a terrorist might carry an explosive in the containers. If those containers holds less than 3.4 ounces, no problem.

Duhhh…what if Ahmed carries one 3-ounce tube? And his brother carries one? And his cousin with the camel nose carries one? And his uncle with dung breath carries one? It has to be pretty easy for these birds to sit near each other and mix them together. To create enough explosive to blow the tail off a 747. Or to blow open the door to the cockpit. Or to create enough liquid to fill spray bottles with acid to blind crew members. Or whatever.

Until now the TSA confiscated all knives. Along with anything that could become a sharp weapon. Meanwhile, the airlines served up wine in small bottles. Bottles which could easily be turned into lethal blades.

They served water in first class in heavy, thick glassware. Terrorists could be trained to crack such glassware into razor-sharp chunks. They could clamp the chunks into devices they could wield and …. Why they would be easily as dangerous as 2.36-inch knife blades.