It's too subjective.
No one 'has' to drink drive, but plenty of proper have little choice but to drive when tired. Bills don't pay themselves, shifts sometimes end at unsociable hours, and poor sleep due to children isn't confined to the maternity leave period 🙄
Many people (including me) are permanently tired. I'm lucky in that I wfh and have a supportive partner, so I avoid driving when I'm at my most tired (we have 2 non sleeping children), but I'm in the lucky minority in being able to choose.
It's subjective how tired someone is, and his it effects their concentration. What next, no driving with a (minor) headache? A cold? Period pains? A crying baby? Arguing children? When already running late and stressed?