Why is it an obvious need that I have a fire extinguisher in my house? I've had them for 15 years, and I've never put a fire out with them. Obviously, they are useless and I should just throw them out.
Your logic is flawed. YOUR fire extinguisher may have never been used in the past 15 years but undoubtedly someone has used their fire extinguisher for the purpose of putting out a fire within the past 15 years. Also the cost of a fire extinguisher calculated against the actual risk of a fire makes it an extremely good value by any bean counters standards. It is obvious that a fire extinguisher is a justifiable in terms of the actual risk of a fire both on paper and in practice. OTOH the back scatter machines and TSA theatrics have prevented zero terrorists ANYWHERE. The cost of these scans in manpower, productivity losses, capital investment on scanners and other lost opportunity costs calculated against the actual risk of a terrorist incident makes the TSA apparatus a terrible value at best. It is not obvious that this is a good solution to terrorism. Fund what works, more counterintelligence and human intelligence operations, not this dog and pony show called the TSA.
Real Programmers don't eat quiche. They eat Twinkies and Szechwan food.