In many places euthanasia is legal and plenty of people chose to die than continue living, that shows that there are people and situations where dying is better

In many places euthanasia is legal and plenty of people chose to die than continue living, that shows that there are people and situations where dying is better than living under any conditions. It's unfortunate that's the choice they are making but it may be the better choice for them. How do we know being a disconnected brain in a container is an improvement over their situation?