RebE > More religious can be influenced from less religious. We should not hate them but we should avoid mixing also.
I agree. It is not easy. My initial concern is about observant people in general, not about lack of it. There is also an issue of separation between “frum” and “modern”. This usually means that “modern” have an expensive private school where they mix with non-observants who are looking for a good prep school with Jewish kids. I think what is mixing is a school with shomer shabbos parents where kids have an _option_ for college track, even if not Ivy league, but reasonably respectable quality.