Jacob Appelbaum likes to call this to the attention of people by comparing it to safe sex practices.

When you engage someone online, you'd like to know a few things about how that person with handle your personal data. If you know someone to be incapable/unwilling to secure your data (analogous to someone indulging in risky sexual behaviour), then you can refrain from interacting with that person on a deeper level (i.e. don't have sex with them).

Pretty hard to do in practice, but if everyone understood this concept it'd be easier to make it work.