Here is a link to an excellent essay by Richard Doerflinger on assisted suicide. Here is his concluding paragraph:
“The people most harmed by this agenda are seriously ill people hearing from society and physicians that death by overdose will end their problems; other patients suffering from a reduced commitment to care; people with disabilities who are next in line to be seen as a “burden” on others; and lonely and depressed people of any age, seduced by the message that suicide is a positive solution. They are not numerous or powerful enough to fight for their rights or make lawmakers treat them as having their own equal and innate dignity. That task, then, belongs to all of us.”