Why is someone entitled to control accumulated wealth after they lose their faculty?
Most parents live for their children. If a parent doesn't want to give wealth to their children, that's fine; the parent can give wealth to their grandchildren in trust, or anyone on the world they choose.
WTF. It isn't ridiculous to respect the fact that unless explicitly given to you, other people’s property is NOT yours and this applies to your parents too. It’s amazing that this has to be disputed at all but it explains why one sees some people with families going beyond will-making to planning for divestiture of their wealth to occur while alive later on.
Giving a gift is great. Taking something that doesn't belong to you is theft.
The number of otherwise good people I've heard refer to "their money" when actually referring to their parents' assets is heartbreaking.
Exactly my point. I understand what you are saying - but in conversation, my reaction is much more like the parent comment, it sounds like an entitled POV. Many people who say such things, in my anecdotal experience, feel they have a right to the wealth, and may not have agreement.
Not directly answering why they're "entitled to", but why they'd want to - they will (likely) still be alive for quite some time, and their quality of life will depend heavily on the resources they have available.