(It's impossible to walk on sidewalks in a city without crossing streets every block, and that's where car/pedestrian conflicts occur)
I think you must first ask, "What percentage of roads in the US have sidewalks?" It's nowhere close to 100%.
And of course outside the village it's miles and miles of fields and forests with none.
Urban life is very different from rural.
(It's impossible to walk on sidewalks in a city without crossing streets every block, and that's where car/pedestrian conflicts occur)