Bruce Schneier in this
Crypto-gram newsletter is worth a read on this subject.
The original poster was not - he / she / it was a troll.
The Crypto-grams immediately after 11/9/2001 are also well worth reading:
http://www.counterpane.com/crypto-gram-0109.html
http://www.counterpane.com/crypto-gram-0109a.html
The newsletters are mostly about computer security
but they make many good points about aviation security - for example why passenger profiling / face recognition schemes are fundamentally flawed.