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My inclination would be as Sqads, certainly for a child, but I can fully understand the feelings of someone being forced to receive such a treatment.
In cases like this there obviously have to be legal tests that can be applied, and were it a child I would have no hesitation - its the fact that this child is actually 17, as capable now of reaching an informed decision as he would be in say 10 months, but not allowed to in law.
Fortunately such cases only rarely crop up.