What are the cons of euthanasia (for humans)?

I emphasize several points: moral obstacles, miracles happen, mental abilities are difficult to determine because one of the critical factors that allow a person to choose death is whether he can make such an important decision mentally. I recommend reading essays about euthanasia, for example, at https://samples.edusson.com/euthanasia/ there are many exciting jobs where people share their opinions and, thus, you will consider other points of view. But, of course, it is the moral aspect of such a decision that pays the most attention.