Roundabouts were introduced in the UK back when car penetration was low and every learner for decades has been indoctrinated into how to use them. It's the education piece that's the problem. People don't intuitively understand roundabouts and you can't magically send that knowledge to millions of existing drivers.
In some sense you have to start sometime, but there's going to be pushback from the accidents and injuries that will certainly happen in the interim.
No, this is just making excuses for not building them. Once you start using them in an area even the drivers that have never used them before will figure out how they work. It’s not rocket science.
> there's going to be pushback from the accidents and injuries that will certainly happen in the interim.
In areas that have actually built lots of roundabouts the accident and injury rate dropped immediately. There was no interim period with higher accident rates.
In some sense you have to start sometime, but there's going to be pushback from the accidents and injuries that will certainly happen in the interim.