OP, you are 100% not being unreasonable.
This is potentially outing, but I'm hoping anyone I know IRL won't read as far as my post...
I've unfortunately witnessed too much death first-hand.
My beautiful mum died when I was 16 - she was only 40. Undiagnosed cardiomyopathy. It was sudden. She was originally pronounced dead at 8pm, only for her heart to restart an hour later. I was told it was an extremely rare occurrence and that she was almost certainly brain dead and had to sign off the DNR. She held on until 4am.
As traumatic as that was and always will be, I stand firm that she had the kindest death of those I've been around for. She was unconscious and hopefully pain free and it was quick.
It was the years leading up to it that were cruel and would have been a case for euthanasia (not that I would have supported it at the time - my mum was all I had!). She had no quality of life. Her spine had basically crumbled from osteoporosis and I was caring for her by myself. She literally could not move from her bed unaided and was so depressed from the pain of it. Her last few years of life were awful and isolated for her, but at least her death was quick and there was no time to dwell on the idea that she was dying. It was over in a few hours.
Since then, I've witnessed several more and frankly it would have been kinder to have let them slip away, rather than watch them suffer and ultimately have a "bad" death.
Currently, I'm supporting the only woman who was kind enough to step up and fill my mum's proverbial shoes. She fell ill only a few months ago, before being diagnosed with an aggressive brain tumor and given only weeks. She is currently receiving end of life medication at a very good care home, but it is simply not equipped to meet her high level of needs. For some ungodly reason, she can't be placed on hospice because of a points system.
The last few weeks have been absolutely horrific. She's gone from being the most independent person I know to effectively losing all of her functions, but still being very much aware. She has been scared beyond belief and only now the end of life medication is beginning to take effect is she more relaxed.
Hopefully for her sake and her daughter's it won't be much longer, but I hate that she has had to go on like this.
I understand the arguments against it.
There would absolutely need to be safeguards upon safeguards in place, but you wouldn't subject an animal to the same torture, so why must we continue to suffer if we can make that choice ahead of time whilst of sound mind?