That's sort of literally true except that it's hard to predict how code will be used in the future. For example, I bet that some dude writing an image decoder

That's sort of literally true except that it's hard to predict how code will be used in the future. For example, I bet that some dude writing an image decoder in the 90's was thinking "it's cool, I don't have to worry about security" because he just knew that his code wasn't going to be remotely exploitable. Anyway, my original comment was supposed to be as funny as your handle. I guess the humor ended up being just in how seriously folks took it. The part I'm not joking about is that folks always underestimate the amount of security bugs that will be found in a piece of code in the future, either because the code ends up used in a way that wasn't predicted, or because some really great bug was just waiting for the right kind of genius to uncover it.