Euthanasia is necessary or not?

       Euthanasia is the practice of killing someone who is very ill and expected never got better in order to end their suffering, usually done at their request or with their consent. Its original mean was good death, but nowadays its became killing by a choice.

      Euthanasia is necessary or not? I don't agree about euthanasia. Euthanasia is illigal in Korea, but some people say it needs for patiets who are really painful. I understand why they want to euthanasia, patients will think they can not be better or make family hard. I think it is an error of judgment by pain of moment. 

Then, human being is valuable. Nobady can hurt anybody. I have heard  many people whose famliy member had euthanasia got stress and regret. Therefore, euthanasia has side effects to people or social. I guess  if it is allowed, some people can use for suicide legally. Can you decide euthanasia if one of your family member is in coma? Nobody can choose it.