Ok Ronnie,

It is called the law of diminishing returns where a significant improvement won't cost just another $1.00/passenger but instead $10 or $100 per passenger. You reach a point that the cost for additional security at any cost becomes prohibitively expensive for the benefits gained. Is it worth it to spend another $100,000,000,000 on something that would only possibly occur every once in 1000 years? What level of threat is acceptable to TSA management? When costs far outweigh the benefits then you've reached the point you're at today.