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<p>I would say yes; such a person needs to be committed, at least to attempt to identify the cause (could be physical), and to see if treatment can possibly alleviate it. </p>
<p>A severely depressed young person is not in a position to make this decision for themselves, no more than a person in a coma, a drugged person, or a person suffering an acute episode of paranoid schizophrenia. It is an illness that completely undermines a person’s perception and judgment.</p>