Yes, because lots of people end up using software with default values. Can you blame them? Perhaps... in a way that you can blame a user who accidentally clicks

Yes, because lots of people end up using software with default values. Can you blame them? Perhaps... in a way that you can blame a user who accidentally clicks a "delete account" button that doesn't have a confirmation step. Good defaults are expected in quality software, and are just as important as any other part of software interface, CLI or GUI.