It's kind of useless to blame drivers as there is little that can be done to resolve that problem. It would be much better to take a long hard look at road layouts. Engineer them for safety rather than traffic throughput.
The answer is basically to segregate traffic by speed, tightly control the interactions between different speeds of traffic and to generally have lighter traffic yield to heavier traffic. This is pretty much standard in every industrial workplace worldwide at this point. Look at what's going on on the tarmac next time you go to the airport.
Of course nobody wants to push for this in 2021 because it conflicts with a lot of the priors and ancillary goals that are floating around the ideological camp that most of the people who care strongly about traffic safety come from.
What makes you say that? Most accidents are driver error. The stats show that CDL drivers, who undergo more stringent testing, have a lower accident rate than others.
"Engineer them for safety rather than traffic throughput."
What would that look like? Even if you replace stop signs with roundabouts, the drivers still need knowledge of how to safely navigate them. If you're talking about reducing speed (technically the most effect if enforced systematically), how do we ensure enforcement?
I guess it depends. Most pedestrians are in cities or towns. The roads there may be straight, but not necessarily wide.
I'm also not sure how a road being straight and wide is a negative. Making them more narrow and winding is arguably less safe. Even if people reduce their speed, you present new issues of reduced line of sight, decreasing available reaction time. You also have reduced performance (braking on a turn vs straight).
Many areas do have some speed bumps. Mostly these are residential or near crosswalks.
Besides that, roads in the US are generally poorly classified. They're often trying to both function as both high throughput roads and destination serving streets. Such hybrid roads are known as "stroads" and they're bad for everyone involved. Stroads are bad for moving cars fast due to the many conflict points (driveways, intersections, etc.) that force drivers to constantly slow down. They are also bad at serving destinations because the many conflict points make stroads very dangerous, especially if you're not in a car. See this video for example: https://youtu.be/ORzNZUeUHAM
But never, ever force the handful of car manufacturers to electronically limit the top speed of their products?
Note: for the top-end German marques, this is just a configuration file change: they are already limited to 250km/h.