The problem is you’d have to tear up a shitton of infrastructure to do it because built-up areas have no room to extend road widths safely to accommodate bike lanes. The driver behind that problem (pun intended) is the car culture and lack of public transportation. They can’t get rid of car lanes to hand them over to walking/biking dedicated areas because there’s too many cars and people that rely upon them to get around. There would never be enough people that would vote for or support such a project. Rural areas DGAF and are too poor to build bicycle infrastructure.

It’s not that we can’T be bothered, it’s the usual problem of Americans not wanting to pay for anything that they don’t use themselves or that might inconvenience them even though it’s good to get cars off the roads and keep people safe.