As promised, an explanation for why people in France drive so hazardly.
Toxoplasma gondii has a life cycles dependent on cats and rats and its effect on the brain is meant to make it easier for cats to catch rats, but sometimes cat excrements end up in farm animals' food, infecting them and passing it on to us. You only risk infection from meat if you don't cook it properly so it's mostly a problem in countries where heating meat can be a problem. France is the only European country where so many people are infected because French cuisine involves so much raw or mildly cooked meat.
This is of course not the only reason why French people are such aggressive drivers, but it does seem to be strongly linked to toxoplasma gondii.
(Also, if people don't want to get help after an accident, get help anyway because they might have brain damage)