Is this even surprising to anyone anymore? Shouldn't we all know by now that the TSA is security theatre, and that if you go on an airplane you have to play the part of a model citizen? You don't actually have to avoid being a threat to the plane, you just have to LOOK like you aren't a threat - or at least like you aren't the sort of threats that ignorant, paranoid fools dream up to fill the void of their knowledge of real threats.
They aren't there to stop bombs - they're there to stop things that look like cartoon bombs. They're there to stop things with uncased wires, or with shiny metal toggles, or with big red buttons, or with fins and bulbous shapes. They aren't there to stop guns - they're there to stop half-inch sized toy guns, or vaguely gun shaped objects, or long narrow tubes, or bananas held up by bored children who say "Bang, bang!" to break the monotony of waiting in line to get through pretend security.
It's a show. It's been a show the entire time. Anyone who wanted to get past TSA security could do so easily. I've been to airports where the security checkpoint was fifty feet away from actively boarding gates. All a determined attacker need do is run the checkpoint and bolt onto an open plane.
A small group of people with firearms concealed in bags could pull up at the front of the airport, walk over to security unsearched, pull out their guns and blow through meeting only token resistance and causing a massive panic as the civilian travelers panic. Then you've got armed hijackers in the unsealed cockpit, however many passengers have already boarded as hostages, a plane ready-fueled to take off... it'd be a nightmare!
But no, photographers are denied their air-puffing devices on the grounds of having fin like legs for standing them up on. The object is demonstrably harmless, but because it vaguely resembles the stereotypical abstraction of a bomb, it can't be allowed.
We need to remember this. We need to stop expecting the TSA to act sanely or rationally. We need to stop employing magical thinking, saying to ourselves "Maybe this time will be different!". It won't. Save your sanity and accept that the only way we'll be rid of this idiocy is by fixing our legislature.