Every country has its own flavor of bad driving. I live in the Czech republic and people here are very aggressive and inconsiderate drivers. However they are not sloppy or inattentive. The roads here are far too complex and busy to even look at a phone for more than a second or two. By contrast, driving in the us is super duper low stress. Roads are super wide and designed to be ultra comfortable for cars and drivers. As a result people are not alert while driving I think.
Another factor is that EVERYONE drives in the us. It doesn't matter if you like it, or are comfortable with it, or even if you're good at it. You HAVE to drive. Over here maybe only 50% of driving age people even have licenses. People who don't like driving don't have to since we have great public transportation.
The most sloppy driving I've ever seen is in the us. People weaving in and out of their lane staring at a phone, people driving into ditches, driving through building walls in parking lots you name it. The reality is that many people just should not be driving a car but are forced to by abysmal american infrastructure and even worse city planning.