I know that there are some adult children who physically can't take care of very ill parents. Some elderly need constant medical care. Some are very hard to keep safe because they have Alzheimer's or dementia. Some of the "children" have their own physical problems because they aren't young themselves. I have some friends, the husband and wife in their late 50's, both have bad backs and diabetes. The grandmother lived with them for several years until her health got so bad (cancer and diabetes) that she had to be hospitalized, and then she died. If she had recovered enough to go home again, I don't know how her "children" would have taken care of her. Neither one of them could lift her.
I know other families who had a parent with Alzheimer's or dementia. They were a danger to other people and themselves. They wandered during the night, set fires, struck other people, etc.
Some older people prefer "assisted living" condos that include lots of friends, restaurant quality meals, social activities, field trips, in-house medical care, amenities, etc. Not all do but some.
I wouldn't want to judge other people's decisions about parent care, especially if I don't know all the facts.
I know two other families ("Caucasian") who have each had a grandparent living with them for decades, thru several moves.
I agree that it's very sad when elders are in places that don't take care of them, and they don't have frequent visits from relatives.