Tell that to the wife (possibly husband) hiding from her (his) deranged spouse.

Data breaches can have very serious consequences for individuals.

If you have this issue in your life, using any service is a bad idea. This includes Facebook, Pinterest, anything. When you interact with services you create data and in many ways data exhaust that can be used to locate you or reveal things about your interests, traits, etc.

The majority of Snapchat's userbase is young, often in their teens, and most likely not an engineer, software developer, or technologist.

I highly doubt they think the same way.

I'd also caution against employing such a cavalier attitude toward your users if you're building something that isn't 100% for the tech crowd.