Back in July 2011 (i have some catching up to do), Rafe Colburn on the hidden costs of security:
I think that people are generally excessively afraid of crime but underestimate the day to day costs that crime imposes. In software engineering, we spend a lot of time and effort on security. If everyone were honest, we wouldn’t need passwords, encryption, or any of the other stuff that occupies a lot of time on every project. We’d still need to take precautions against damage caused by user error, but most of the hours we spend on security could be spent on other things.
The other cost of security, beyond implementation time, is the ongoing cost related to the inconvenience of security. Whether it’s the time we take to unlock our screen or set up SSH tunnels or deal with the fact that we have to decrypt data in the database in order to see it, it all counts. Security is almost always a form of technical debt.
Which again reminds me of Steve Yegge’s epic Amazon-Google rant:
[…] I’ll argue that Accessibility is actually more important than Security because dialing Accessibility to zero means you have no product at all, whereas dialing Security to zero can still get you a reasonably successful product such as the Playstation Network.