Prejudice and lack of understanding of disability is shocking. She was in her 70s with dementia but MiL died in hospital, they said she wouldn't eat and pulled out feeding tube so there was nothing they could do. A family friend working in another part of the hospital managed to go and see her, she didn't have her hearing aid or glasses, she was deaf (had been since childhood) and relied on lip reading, so had been left completely unable to communicate. She could sign but I can't imagine many staff in hospital can. Family kicked up a fuss, glasses and aid were found, she died, she may have anyway but it must have been so frightening for her and criminal to just disregard the fact that they'd left her unable to understand.
It's often not just an underlying condition, it's a combination of that and a lack of care, understanding and attitude towards people with disabilities that they aren't quite as valued, they're a burden, extra work.
Well before this pandemic a woman with autism filmed her treatment in hospital and it was just horrific, the staff were so angry with her because she was being loud, because she was scared, a security guard with experience of autism stepped in and calmed her and advocated for her. The medical staff just didn't know/care. All she needed was to be listened to.
Even mild disability like ADHD has shocking consequences for reduced life expectancy. A lot of it is down to reduced income, poorer diet, increased risk of drug addiction, risky behaviour. If it's treated and managed the risks reduce completely, but can you get diagnosed and treated by the nhs as an adult? Not in my experience.