I don't think suicide is inherently a much worse cause of death than many others, but it is often associated with a mental illness, outside of which the sufferer would not choose to die. Althoigh the illness manifests as free will, it is an illness nonetheless that might be treated. I don't mean to say that it is impossible for a person of sound mind to choose not to live any longer. However, given how often treatment results in improved will to live and improved quality of life, I think it would be irresponsible to assume a healthy mind without challenge and go to euthanasia as a first resort standard of care. We certainly wouldn't do that for any other presentation of symptoms.