I skipped right to the conclusion, as I wanted to see what the document says, and it kicks of with "where no other treatment exists", and to prevent self-inflicted amputations. Plus it acknowledges that these people potentially need help _now_, before we find better solutions in the other fields.

I can highly recommend to give the conclusion section a read. I think the authors are well aware of these issues, to the point that this scoping (no other treatment available right now / other options exhausted + person needs help right now) makes me slightly supportive.