I've struggled with mental health issues my whole life, including depression. It's anecdotal but my feelings of hopelessness and pain were not something I wanted to share and burden anyone else with unless they were professionals. I've had these thoughts, and would never do this in front of family no matter how down I was.

Edit: I've also been on the other side of this. Seeing loved ones and family in this situation is _fucked up_, and leaves lasting emotional damage.