My dad was diabetic and didn’t look after himself.
When he started having regular hypoglycaemic episodes, we would discourage him from driving anywhere and made him upgrade to a smaller vehicle with better safety systems.
He was an entitled baby boomer who didn’t respond well to his Silent Generation Wife and Gen X and Gen Y kids telling him what to do, but he was able to do much less damage to himself and others in a TS Astra than in a big HiLux CrewCab, especially if we hid the keys on him.