Paul de Vries' attempt to defend group accountability behavior is rather bleak and ridiculous. Perhaps de Vries did not read The Japan Times enough, as he surely would've seen that quite a few men, both foreign and domestic, ridicule the women-only train cars. I also stand against the policy, as it hardly equates to the need for men-women restrooms.
It was because of group accountability that hundreds of thousands of Japanese were ripped from their homes and sent to camps in the United States during World War II. These individuals had done nothing but be Japanese, yet they were punished. Insistence on group accountability, at its core, is largely seen as leading to horrible experiences, but apparently not if the group in question are foreigners in Japan today.
Well, then, why don't we take things a step further? Since Japan attacked the U.S. on U.S. soil, why don't we just remove all Japanese currently living in the U.S. and ban Japanese citizens from entering the U.S. — to guard against another possible attack in the future? Rather ridiculous, I'd say, but this is how dangerous the notion of group accountability can be.