Having assisted in the euthanasia of many animals (including my own), i can absolutely, hand on heart, say that it is absolutely right thing to do in the majority of cases. Obviously there have been times when i have felt the decision has been made too soon, or that the owner might be put into the position of having to make the decision based on financial considerations, but generally it is because people don't want their pets to suffer and that can no longer be prevented. .
Its something i always feel sad about, but never bad about.
I have often wondered if a dying animal knows it is dying? I would choose euthanasia over watching an animal die every time.
I don't feel the same way about euthanasia in people if i am honest with myself. I think anchordowndeepbreath summed it up for me. There are too many grey areas. I am not against it, it is one of those things i genuinely don't know the answer to. I try and put my own self into the position and its too much to comprehend - being in so much pain that i couldnt bear to live seems fairly straightforward if you know that pain is never going to stop, but never see my DD again? What if something changes? What if there's a cure?
What is "sound mind"? Is it being able to name the prime minister and count backwards from 20? Someone (who is not "physically" unwell) who is suicidal might not be considered to be in sound mind simply due to the fact that they want to end their own life, so foreign is it to most people. There most certainly would be an element of not wanting to burden my family too, its not like i could say to them, you know what, just leave me in the hospice and never visit again because they wouldnt be able to do that,, and if they did that is not fair to put that upon them, they will feel guilt.
So many questions and a very valid and interesting OP.