I am in pain, not incompetent. I am a consumer of mental health services. I have the same rights as any other consumer. That includes the right to make my own informed decisions about treatment. Forced treatment is force, not treatment.
More damage is done by forced treatment than by no treatment.
If a friend or family member has a disorder that is causing difficulty in their lives, they are aware that something is wrong. If they are using denial, it is because they are afraid, because they don't know what's wrong or they don't believe there is help. If you can find printed information and make it available to them without pushing it on them, that would be best. If you don't think it fits, ignore it. If society can tolerate only a narrow set of thought and behavior, maybe society needs shaking up.