We have examined every major index of crime on which the authorities rely. None show a recent increase in girls’ violence; in fact, every reliable measure shows that violence by girls has been plummeting for years. Major offenses like murder and robbery by girls are at their lowest levels in four decades. Fights, weapons possession, assaults and violent injuries by and toward girls have been plunging for at least a decade.
If one group is more prone to violence, it’s middle-aged men and women, they write, but you don’t hear about “mean middle-agers.”
Of course, Males and Lind are looking at criminal acts, which are easier to track than the typical girl-on-girl harassment, which is mean but not criminal.