I think most able bodied people just don't realize how difficult life is for disabled individuals, or they see our issues as always being someone else's problems to handle- out of sight, out of mind. They also overestimate the purview of current medical science and public services. Because of this, they think every disabled person can have a life worth living and that we are all getting adequate support, when that can't be further from the truth.
Having many able-bodied or neurotypical friends throughout my adult life has taught me that I only have value to others if I can mask my disabilities and health problems, or be productive with little inconvenience to others.
Yet, most would insist I need to be kept alive because it disturbs their perceptions of the sanctity of life. Many times I have heard people say that my life "really sucks" before they promptly go back to talking about all of the cool and amazing things happening in theirs. People laugh and make jokes about me being a cripple because I can't walk as fast as them and am always struggling.
It is such an absurd joke to me how people forbid euthanasia from becoming legalized, then treat disabled people badly, or speak on our behalf about matters they frankly don't know shit about. Or you also have those cases where a high functioning rich disabled celebrity talks about how euthanasia is extermination or something. You don't see those people giving any money or resources to actually help disabled people survive though. It takes the piss.
I'm so tired of having these shitty chronic health problems and disabilities, then being treated like a massive burden when I don't want to be alive in the first place. I think people believe they are being compassionate because to them, life = good is a default assumption, regardless of any other conditions.
But my life fucking sucks and people who are privledged enough to have good health will never understand. They never had chronic GI problems, they never had to be held to the floor crying and given enema treatments, they never become a pincushion for tests, they never had invasive surgery, they never had 24/7 pain, they never had to plan their lives around taking medication that doesn't work, or fighting with the medical system, to be discriminated against at every turn for something you have no control over, they don't sleep 12 hours a day, they dont have to cancel plans or be flaky because of sickness, they don't spend most of their life in bed, and yet THEY GET TO DECIDE IF I CAN DIE PEACEFULLY OR NOT???
Until they have to live like this, I don't see why those with power get to make decisions on behalf of a group of people whose experiences they frankly know nothing about. Also, most laypeople have no idea how medical research works and think everybody needs to wait half a lifetime for some magic cure or quality of life enchantment which may not even be in the current research and development pipeline, or is stuck in the early stages of pre-clinical research. They think everybody has the potential to be cured.