Comment by defrost

Also their families (the kids normalise no seatbelts and spend their childhood with no seatbelts), also first responders (???!!!)

In reality, the worse an accident is (deaths, injuries) the longer and more difficult the clean up process is .. increasing the time that normal traffic flow is impacted and increasing the danger to all those attending who are exposed to potential (and common place) cascading disasters.

The deaths and injuries impact the local health response services - raising costs, demand for resources, and impacting triage decisions (fewer injured non seatbelt wearing idiots to look after, more free resources to devote to other patients).