Answer:
It might. If someone is suffering, with cancer, for example, that is the only way to ease their suffering. Also, it eases the pain of those dear, knowing that they are not suffering or in pain anymore.
However, that doesn't make it right. Doctors who pity a patient are meant to help them get better, not end suffering. That job is for priests.
When nothing else works and someone wants to end their life with dignity, when there are no more painkillers that work and they are looking at a slow painful agonising death...it is def helpful. One have to remember that it only takes place with the patients approval. And dealing with death is also a part of a doctors job.