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It's not libel if it's true
This might be the case in the US, but in other countries the law might be different. Not sure about Japan, but countries in which proving "truth" is not a valid defence against an accusation of defamation do exist.
Of course they might be immature, since what they might consider "sexually inappropriate" might be perfectly fine within that specific working environment, making them the problem. If you want to work as a waitress in a topless bar and consider working topless "sexually inappropriate" the problem is yours: nobody forces you to work there as nobody forces you to contribute to this specific project.
Basically "inappropriate" sometimes just means "I personally don't like it so it should not exist at all".
You're still missing the point. The amount of sheet metal surrounding you doesn't determine your worth but it surely determines the outcome of a collision with something else, be it your fault or not or even without a fault at all. A pedestrian has to accept reality: if he gets hit by a car he easily risks injury or death, which means that for him being careless when crossing is much more dangerous.
Common advice for "soft" street users, be it pedestrian, cyclist or motocyclists, is to assume that everyone else is either completely incompetent or actively trying to kill you since in case of accident you dont want to be right but dead, you want to avoid the accident in the first place.
You cannot force other drivers to always pay attention or always "do their jobs": it would be nice but reality begs to differ. Being defensive is the best survival strategy.