No individual case is typical of a group at large. My own grandmother was in care for twenty years and she had the chance to leave for the last eighteen and live with family, but nope. She rebelled against it because she'd made so many friends and found the activities and interaction more rewarding than being stuck at home. She could barely walk all that time, was seriously overweight, pretty much lived on her commode and had a colostomy bag. But she still valued her quality of life and was happy.

There are plenty more examples like that (there certainly were in the 'home' where she was accommodated) but of course, there are plenty of unhappy elderly people in care as well. It's a myth that the second group is more typical than the first.

And of course the dynamic for younger disabled people is different, but they are far more likely to self harm or commit suicide than others in the same age group. Few people would support the general suggestion that they should just go to Dignitas and do it though.