Can you imagine scenarios where the state, or the family, or the physician are incompetent, selfish, or malicious in determining the competence of a person? I believe there are MANY such scenarios.
This isn't a hypothetical for me... like the author of the article we're discussing, I've had close friends suffer from schizophrenia and depression, and seen one of them involuntarily institutionalized. I wish it was so clear cut SpaghettiCat, but I think the majority of mental health cases are not so black and white as the one in the article.