I would not confront my therapist about any of their personal issues whether it's an illness, substance abuse, personal problems etc. If their problems start manifesting themselves in therapy then I would confront them about things they do as a therapist that don't work for me. Then I'd make my own decision of it's time for me to stop seeing them. Beyond that I wouldn't go into discussing anything that has to do with them personally. It's up to them to figure that out. It's also appropriate for their family members, friends, colleagues, therapists to show them some "tough love" and to let them know that they need help. It's not my place to do that. My relationship with them is professional and so I can only confront them about things they are doing professionally.