There is no existing informal fallacy in the literature to cover the following type of reasoning. I quote from the Feb 5th Edition of the Sunday Times (UK).
NURSES want patients who are intent on harming themselves to be provided with clean blades so that they can cut themselves more safely.
They say people determined to harm themselves should be helped to minimise the risk of infection from dirty blades, in the same way as drug addicts are issued with clean needles.
This could include giving the “self-harm” patients sterile blades and clean packets of bandages or ensuring that they keep their own blades clean. Nurses would also give patients advice about which parts of the body it is safer to cut (my emphasis)
I believe that the time has come for the creation of a new informal fallacy - the WTF? Fallacy.