It is always the same story. Apparently, research, most of it from a feminist perspective, have since the 70s clearly shown symmetry in DV perpetration, and in fact a majority of female perpetrators in light non-reciprocal violence. The figures check out when you compare responses of each gender. I was incredulous at first, and so is everyone I tell about this. That cannot be. 

But then they stop to think. Invariably, they know someone whose wife used to lash out. It just never registered as an offense at anything like the scale it would have had the genders been reversed. 

I would not go so far as to say the problem is not gendered; reasons and kind and justification of violence differ. But I am wondering if a good part of the serious male-perpetrated violence is not the result of defense or backlash against non-reciprocal DV. Torment someone for years, and he may just snap.