I do agree however, that placing one’s family at risk – even a little – is outside the bounds of hishtadlus. Chayecha kodmin.
Kiruv kollelim usually operate in groups; they ensure that the yungerleit have accesa to charedishe mosdos, and proper standards of yiddishkeit for their families. Every local kiruv family that I know insulates their kids from exposure to the chevra they are mekarev. Campus kiruv is something i personally feel is mishandled. Mike moskowitz supposedly became pro LGBT because of his discussions with college kids who he was supposed to be being mekarev. The dangers of immersing one’s self in such an environment should be enough for us to take stock of how we do kiruv at colleges.