Ziggurat
Penultimate Amazing
- Joined
- Jun 19, 2003
- Messages
- 61,716
Forgive me if I'm being naive, but if the TSA isn't there to thwart active attempts at attacks, then, uh... why are they there?
The point was that the mere presence of a security measure can decrease the frequency of attempted attacks. Measuring only attacks that were thwarted with that security measure doesn't tell you what you want to know (how big an impact on security the particular measure has), because in the absence of any particular security measure, other attacks might have been attempted and might have succeeded, but instead never got executed and so don't get measured.