Is euthanasia wrong?

Today, I'm going to talk about 'euthanasia' which has been being hot potato since the concept was formed. To tell conclusion first, I don't think euthanasia is wrong on the premise that the patients who are suffering from diseases or who already died agreed with that. Also, if the patients couldn't make a choice because of accident which happened all of sudden and if the family can't afford to pay hospital bills, it will be a torture or nightmare to all of them. In that case, euthanasia can be be allowed. It's just my opinion, but I think the patients will agree with euthanasia, too. They also don't want to be a burden. Some people may claim that it cannot be allowed to administer euthanasia only by doctors or patient's family. However, usually euthanasia is administered when patients have brain death or when patients in a vegetative state. In this situation, patients can't decide anything, so their parents or siblings decide everything as a guardian. That's why I think euthanasia isn't wrong.