I agree that if our lives belong to ourselves (a fundamental idea in Western thought) then what greater right do we have than to end that life if we so chose?
This is especially troubling in the case of terminally ill patients who, be being hospitalized, may not have it in their power to end their lives. I can see how difficult this is morally for doctors, but I think that someone on a lifesupport regime should, after a couple of meetings with a councelor, be given some means to end their own life, doctor assisted if necessary.
In the case of people in vegatative states, when the choice is made by family to end their life, the person in question suffocates or starves... perhaps two of the most unpleasent ways to die. Wouldn't it be more humane and respectful to end that life by a doctor painlessly and quickly?