I've been to germany, they have their own reckless idiots driving. as well as uk. Not sure what you consider more competent. yes they do have more complex rules and more road signs. however it does not make them better drivers. US is much easier and simpler in that regard. There is just no need for american drivers to know as much as german drivers, cuz that knowledge does not apply to us roads. I do not see how it makes them less competent drivers
However our fatality rates are 3x of germany, but the reason is not driver competence, but reckless disregard for life. just look into fatal accidents, you'll see vast majority of driver causing such accidents are under 30 years old males, who are intoxicated and\or drive stolen cars. with total disregard for rules, they do not really care what happens, even if arrested they are released with no bail and charges will most likely be dropped, You can thank liberal bail reform for that, not lack of knowledge.
just this morning on my drive to work listening to the radio, 24 year male went thru red at high rate of speed hit an suv with 2 seniors, both died, a week before a 16 years old drove a car much faster than speed limit, lost control of thre car hit a tree, everyone in the car died, there was 5 people there, oldest was 17. and it was only in new york city, Every week I hear of 1 or 2 fatal accidents. Ever day on my way to and from work i see at least 1 accident, often multiple, most are minor collisions, with no injuries, but sometimes it gets really bad. so bad that cops have to close a part of the highway.