I do get what you are saying FL.
And I'm glad this topic has been raised, it's good stuff to think about.
As someone who has had chronic fatigue syndrome and lives 800km from family, it is really not as simple as it sounds in practice.
I'm a lot better now, but no doubt I have driven when I really shouldn't have in the past. Short of having a full time carer move in with me and the kids I really don't know what else I could have done though!
I don't think my situation would be unique either... what about people on medications that dull your reflexes? what about people suffering from anxiety/depression and the 'brain fog' that can cause?
It's tricky. Good to think about though.