Driving discipline, culture, and rules in North America are Mickey Mouse.
The reality of car dependency there means that there are people driving and owning cars who can't really afford to do it properly, nor do they know they need to do it properly (e.g., having a second set of tires for the winter). You can see this evidenced by the rust buckets on the road that look like they are one pothole away from losing part of the vehicle body. Deferred maintenance and investment everywhere and in everything …
The United States also covers a vast difference in climate. What good are snow tires for people in South Florida, or Texas, or New Mexico? Where I live I switch between summer and all season cause we get enough snow to justify snow tires once a decade for a couple of days. This year has been the worse with two weekends with a decent amount of snow that was cleaned off the roads by Tuesday.