The letter displays problematic logic in the interpretation of its findings. In relevant part, the authors say:
Our results support the point previously raised by researchers from Hong Kong that this new method may have attracted individuals who would otherwise not have considered suicide. Acute stress, particularly economic difficulty, rather than mental disorders may be the major precipitating factor of suicide in this suicide subgroup. Population-based prevention strategies to prevent charcoal-burning suicide that might be considered include efforts to destigmatize mental illness to enhance appropriate help-seeking behaviors, restrictions on access to charcoal (for example, by removing charcoal from open shelves and making it necessary for the customer to request it from a shop assistant), and guidance for the media on how to report on suicide events. [Emphasis mine; citations omitted.]
The authors' perspective is that the availability of the method is what is causing the suicide. But isn't it the individual's choosing to commit suicide that is the proximate cause of the suicide? Is the "cause" of suicide the man or the gun?
The authors assume that suicide should not be allowed and that it is right to prevent it. Why should this be? No reason for or defense of this position is given. People committing suicide using the charcoal burning method are not likely to be mentally ill! Why shouldn't they be allowed to choose to commit suicide in a relatively painless manner? Even forced life advocate Ezekiel Emanuel purportedly favors a "negative right" to suicide for rational people.
In addition, the authors' proposed solution to the problem of non-mentally ill people committing suicide is: destigmatize mental illness. Huh? My interpretation of the data is that charcoal burning suicides are likely to be rational suicides - not the product of mental illness. How will destigmatizing mental illness help anything here? The authors also, predictably, recommend coercive suicide prevention methods (using the laughable tactic of restricting the sale of charcoal - no picnic barbecue for you if you look sad!) and media censorship.
There is little evidence that "destigmatizing mental illness" will prevent suicides in these cases. And even if coercive suicide prevention does prevent some suicides, they will be the wrong suicides. Take away the right to charcoal burning (not to mention the right to barbiturates), and you force people to choose between committing suicide by violent or ineffective means, or remaining alive in misery. And that is wrong.