What a wild assumption, that the Transport Security Agency's purpose is security... > I am almost 100% certain that there are and have been many, many programs

What a wild assumption, that the Transport Security Agency's purpose is security... > I am almost 100% certain that there are and have been many, many programs in the past that have lasted for a far longer period of time than the TSA has so far, which were/are less than or equal to 5% effectiveness for their supposed purpose. Why is it OK to make this assumption but not assume that the TSA is trying to to their job, even if their success is disputed?