So what do you suggest for a person who has bad enough dementia that they’re no longer safe to be left alone at all, are likely to burn the house down, and having hidden all the door keys, won’t be able to get out? Who refuses to wash and/or change dirty, smelly clothes?
Who has forgotten how to use the phone, or repeatedly hides it so that they can’t find it? (Or thinks the TV remote is the phone and then complains that it’s not working?). Who is repeatedly locking themselves out, including at night time in winter, in their night clothes?
Who can no longer even make themselves a cup of tea, yet despite all the above, still genuinely thinks there is nothing wrong with them? (Because they can’t remember that they can’t remember anything).
Almost anyone, with or without dementia, will say, if asked, that they don’t want to go into a care home, but when the sort of 24/7 care the person now needs can’t be provided any other way, it may be the only practical option.
We ‘put’ our (self funded) mother into a very good care home, because it was the only place she could receive the 24/7 care she needed. And no, she wasn’t happy at first.
During her first weeks there she would angrily accuse us of only putting her there because we were after her money - very hollow laugh. If we’d been after her money we’d have left her at home, in increasing squalor, and all too liable to burn the house down, with herself in it.