From what I've read, starvation isn't actually that terrible.
For example: [1], quoting:
> Instead of feeling pain, the patient experienced the characteristic sense of euphoria that accompanies a complete lack of food and water. She was cogent for weeks, chatting with her caregivers in the nursing home and writing letters to family and friends. As her organs finally failed, she slipped painlessly into a coma and died.
> “What my patients have told me over the last 25 years is that when they stop eating and drinking, there’s nothing unpleasant about it — in fact it can be quite blissful and euphoric,” said Dr. Perry G. Fine, vice president of medical affairs at the National Hospice and Palliative Care Organization in Arlington, Va. “It’s a very smooth, graceful and elegant way to go.”
Patients under sedation don’t feel pain from starving or dehydration. If they were conscious the pain from their own illness would be considerably worse.
Patients under general anesthesia don’t, sedation is less certain. For obvious reasons, there’s no corpus or research into the issue, so it’s left to supposition. Remember that “sedation” and “unconscious” are not necessarily the same.
>Whether palliative sedation truly ends suffering is not knowable, although doctors perceive indications that it does. “You might be able to tell if their blood pressure goes up. Same with their pulse,” said Nancy Crumpacker, a retired oncologist in Oregon. “And you read their faces. If they are still bothered somehow, it will show in their facial expression.”
If she wasn't conscious and didn't feel any pain I don't see how it's "worse" than any other method of death. The whole purpose is to make the patient not suffer.
That's horrible.