I'm afraid I disagree. As other PP have said, fine if elderly parent(s) are taking care of themselves but - especially in the case of dementia - often they are not and the family carer has run out of options.
My own elderly mother couldn't care for herself at all. She had dementia for some time and family members were trying to cope, but by the time my mother no longer recognised them, things were becoming difficult. My mother refused outside carers (she would scream at them and brandish her walking stick), she couldn't go upstairs in the end so she was going to the toilet randomly downstairs around the house, she would leave the electric oven on, she even fell one day and was lying on her own until someone came and found her.
But if we suggested going into a home or having some sort of care, she was alert enough to scream 'no, no' and this was considered capacity to understand.
We contacted social services who very kindly convened a meeting between family members, a social worker, the visiting nurse and a dementia psychologist. We explained we were desperate and at crisis point, and that without something done my mother would be seriously at risk. They finally concluded they had to take over and they did remove my mother, firstly to a hospital setting where they assessed her and then onwards to a nursing home where she received so much better care than we could ever have given. It was such a relief, and in fact my mother calmed down and was much happier too.
Family members can only do so much and, if they do not have the resources or they are at the end of their tether, yes they certainly should be contacting social services. With our own mother I wish we had done it sooner, it was the best thing despite it being against my mother's wishes.
I have had a long talk with my own adult children, who saw all this happening. I have explained I would expect them to do the same if I ever went the same way with dementia. I am happy to go into a home but if dementia changes my personality, they must do what is best from a care and safety point of view, not what I might be rambling on about at the time. Hopefully it won't be as difficult for my own children as it was for us in respect of my mother.