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John Deigh, PhD, Professor of Philosophy and Law at the University of Texas at Austin, in his 2002 article "Physician-Assisted Suicide and Voluntary Euthanasia: Some Relevant Differences" published in the Journal of Criminal Law and Criminology, argued:

“As a matter of common sense, killing yourself is a lot harder than having someone do it for you. Assuming this bit of common sense is correct, there is reason to suppose that people, on average, are less susceptible to being pressured into killing themselves than they are into letting someone kill them…

A second consequence of the common sense point concerns the acts of suicide and submission to euthanasia that would in fact occur as a result of legalization. One natural way to understand the thought that killing yourself is harder than having someone do it for you is that killing yourself requires firmer resolve. The element of passivity involved in your letting another perform the unpleasant task of putting you out of your misery means that your will is not as active as it would be if you performed the task yourself, and thus weakness or irresolution in the will is less likely to cause failure, less likely to cause an interruption in the lethal action. Conversely, then, a completed act of suicide warrants more confidence in its having issued from a will that was strong or resolute than does a completed act of submission to euthanasia. Accordingly, though any act by which a person deliberately hastens his or her death raises concerns about its voluntariness, there is less reason to worry, other things being equal, about the voluntariness of suicide than about the voluntariness of submitting to euthanasia…

One can, to be sure, imagine physician-assisted suicides that are not significantly different from submitting to euthanasia. Assisted suicides in which the amount of assistance is so great as to reduce the patient’s role to that of merely taking the very last steps, nothing more than opening a mouth, say, and intentionally swallowing a capsule placed therein by the physician are, practically speaking, equivalent to submitting voluntarily to active euthanasia. And if such suicides were typical of the suicides that resulted from legalizing the practice, then one could not seriously object to conflating it with voluntary active euthanasia when making utilitarian arguments against their legalization… But neither [Yale]  Kamisar nor, as far as one can tell, any of the prominent opponents of legalization he cites offers reasons to think that such suicides would be typical. “

2002