* Is it because someone else performs the injection? Then what about suicide by cop, and cases where the patient injects herself?
* Is it because their family members join them in that initial feeling of peace following their decision (which suicide prevention pamphlets warn to watch for)?
* Is it because a cancer patient really is better off dead? Then so are many other seemingly-hopeless people, who are depressed, abandoned, and addicted. Is it because doctors agree that they are better off dead?
Nobody is pro-suffering, but sometimes we must suffer for the things that make us human. When we hear about deaths, aren't the most painful ones those where a person has said "this human life is not worth living"? No inanimate disease can say something so painful, can affirm it so permanently through willful action.