Difference between feeling secure and being secure

Bruce Schneier's latest Wired column examines the difference between feeling safe and secure and having security.

If we make security trade-offs based on the feeling of security rather than the reality, we choose security that makes us feel more secure over security that actually makes us more secure. And that's what governments, companies, family members and everyone else provide. Of course, there are two ways to make people feel more secure. The first is to make people actually more secure and hope they notice. The second is to make people feel more secure without making them actually more secure, and hope they don't notice.

The key here is whether we notice. The feeling and reality of security tend to converge when we take notice, and diverge when we don't. People notice when 1) there are enough positive and negative examples to draw a conclusion, and 2) there isn't too much emotion clouding the issue.

Both elements are important. If someone tries to convince us to spend money on a new type of home burglar alarm, we as society will know pretty quickly if he's got a clever security device or if he's a charlatan; we can monitor crime rates. But if that same person advocates a new national antiterrorism system, and there weren't any terrorist attacks before it was implemented, and there weren't any after it was implemented, how do we know if his system was effective?