I’m biased because I bike everyday through Boston but - I just don’t agree with their assessment that they are a problem, or at least to the degree that it’s definitively worth addressing.
Being visible as a pedestrian or biker is a lot easier with kei cars parked on the street than some of the F150s I have to deal with now. Many of Boston’s streets are also notoriously tight compared to other sections of the country.
If there was wider movement kei cars (which is a big assumption - I can’t imagine many people would be willing to tolerate right side driving) there would be more road injuries of the drivers, probably, but that would also be weighed against injuries to non drivers.
