This does not surprise me at all. I harbor no illusions that females are any less capable of wickedness than males. (Is the undeniable fact that young men are responsible for more violent crime than young women due to inherent biological differences or to societal and psychological factors? I suspect both. In any case, it cannot be accepted as "normal" in either sex.)
Here's an article about this problem:
Crusade to Curb Girl GangsThe trend is very real:
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By 1996, the most recent year available, the anecdotal evidence had turned into a documented social problem. During the previous four years, the FBI's violent crime index for young girls had risen 25 percent. During the same period for young boys, it remained level.
Why?
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What little research that's been done has tied the increase in violence and gang activity among young women to a variety of factors. They range from the breakdown of the family and increase in child abuse to the heightened levels of violence on the streets and on television to society's changing gender roles.
Estimates suggest that at least 70 percent of female juvenile offenders have been victims of child abuse. A study done by the Center for Women Policy Studies in Washington found that young girls who had been victims of violence - sexual assault or physical abuse - were twice as likely to believe violence was an acceptable way to solve problems.
A strong effort to prevent child abuse seems like a reasonable place to start dealing with this problem. Trying to go back to "traditional" sex roles, in my opinion, would cause more problems than it would solve.