That perhaps could be a valid argument, if the TSA had clear, set rules on prohibited items and if those rules were consistently followed by every TSA'er. However, as we all know, they practice deliberate obfuscation, so as to keep the terroristas confused and on their toes. As a result, items which are not clearly defined as prohibited, and are permitted 9 times out of 10, still get confiscated/stolen at random checkpoints. That's the policy.