Of course you have to consider confounders. That’s why transportation data usually includes best efforts.

But at some point you have to look at the totality of the evidence. Countries with better road infrastructure, enforcement, vehicle standards, and driving behavior generally produce better safety outcomes. The fact that multiple factors contribute doesn’t make the observed outcome meaningless.

As I already stated there is absolutely systems that increase the perceived sense of risk that can help outcomes (road width sizing, roundabouts, minimal signs/lines) but those typically work best in a system where there is already some sense of order.

Less Reddit style snark would go a long way too.