“I am not indicating whom I was talking about. All I am saying is that in circles where girls and boys freely meet bad things happen. “
And you know this how, exactly? What circles of boys and girls have you moved about in freely? I have myself been in such circles, and my daughters go to singles weekends in such circles, and NOTHING bad ore ven remotely bad has EVER happened, and it is kind of loshon hara for anyone to say differently with no basis, just because their own hashkafa does not hold by this. Yes, SOME mixed groups of kids MIGHT have a problem (they would under any cicrumstance), but modern Yeshivish kids know proper behavior and are very respectful of frum boundaries.