HaKatan: Please give some situations where MO allow modernity to trump Torah.
As for schools, most MO schools do not have mixed classes for all ages. They have them in pre-school, and maybe for the first couple of grades, but after that, it’s separate classes.
Can you explain to me why halachicly that is wrong? There is no yichud involved. The schools stress that touching between genders is not allowed. In the school my children are in, once they get to sixth grade, the schools are completely separate – different buildings, although they are under the same banner.
Chareidim have taken on many chumros over the past 50 years or so. When R’ Moshe Feinstein married off his children, they had mixed seating. At every yeshiva dinner back then, there was mixed seating. The standards of tznius back then were fine halachicly – but wouldn’t be considered so today (at least not by chareidim).
And where has this led chareidim? To a society where people are judged by how they dress, not by how they act.