Even in Europe, cars are quite common for everyone. Maybe less for the middle class in big cities, but the traffic in London and Paris is quite terrible.
By that logic pretty much every accidental death that's a result of the modern world would be "caused by humans". House fires, heavy equipment mishaps, cancer from exposure to exotic man-made substances, overdoses, icy staircases, it's a long, long list.
Seems to me that adding all that crap in would make the category so broad as to defeat the point of categorizing. IDK if that was your point or if you just wanted your pet issue in the category.
We have many ways to lower car accidents and deaths in a country like the US. No effort is given to public transportation. Not counting them wouldn’t make sense unless enough effort was put in to lower those numbers. An accidental house fire isn’t the same thing at all. There weren’t major decisions made to purposefully allow sprawl and lack of funding into something that lowers house fires.
Interesting case, but some of these are more like suicides (intentional or otherwise), and I think we were talking about one organism killing another. But still, you're correct, some significant portion of these must be one human killed by the actions of another.