Why might that be? Euthanasia consciousness rests on two intellectual pillars – that killing is an acceptable answer to human suffering, and radical individualism in which we all own our bodies and have the absolute right to do what we wish with it, including make it dead. But interestingly, the latter idea–often reduced to that most effective of all soundbites, “choice” – turns out to be far less robust than the acceptance of active killing as a proper method of ending suffering. In other words, once a society accepts killing as the answer to suffering, the request element becomes increasingly less important as doctors assume they are doing what is best for the patient by extinguishing their lives...
(Wesley J. Smith, "Legalizing Euthanasia in Belgium Unleashes Nurses to Do Doctor-Ordered Non Voluntary Killing," First Things)