Some theoretical arguments.
J. David Velleman argues that the considerations raised by
Yale Kamisar that offering a choice to a gravely ill person risks
Quote:
sweep(ing) up, in the process some who are not really tired of life but think others are tired of them; some who do not really want to die, but who feel they should not live on, because to do so, when there looms the legal alternative of euthanasia is to do a selfish or cowardly act
weighs against giving people a choice rather than against euthanasia in those situations where the person is unable to choose, it also doesn't require the external pressures in the practical objections I raised above and both types of argument seem to meet a standard of rational irrespective of whether I think they are compelling. At the level of theory the rights and wrongs of euthanasia aren't, to my knowledge, debated on the grounds of whether or not we'd require families to restrain their loved ones as they are euthanised.
The above is from Ethics in Practice Hugh La Follette ed which is a decent primer on ethical theory and practical considerations.