Redis doesn't market itself as a general purpose database, more as an advanced memcached, which is why those make sense. People who value performance over durability can of course change the setting, being aware of what they are getting into. That's very different from someone who doesn't realize that just because his database seems to save his data doesn't mean it won't eat it tomorrow because he didn't know to change the configuration. I stand by my judgment of hopelessly stupid.