Germany has also tried women-only cars and there have been discussions of having them in the UK, but they were rejected not because they're not needed but due to the optics https://en.wikipedia.org/wiki/Women-only_passenger_car#Europ...

Not saying this as whataboutism or to defend anything, just that men are probably not always aware of the problems women face even in the west so be vigilant when you ride public transport and don't think it's only a Japan problem.