Some seniors are very stubborn. Guess what? Some teens are very stubborn. And so are some boomers. So, there will always be people who need to be strong-armed into giving up the keys. And, again, when a senior is coping with dementia, you are likely looking at a battle, because the ability to reason dies as the brain damage increases.
But before you jump to conclusions about "that old guy up ahead," look to your own driving habits. How close a call did you make on that last red light? Seems to me it was yellow turning to pink, at the very least. Be honest now.