mont - I'm at work so don't have time to read all the way through both papers, but thanks for linking.
I did just look at the results section which has this to say: " the men in the sample were more likely to use
severe violence, less likely to be injured, and they were less fearful of their spouses. "
You suggested that the empirical effects, ie damage, done to a person should be taken into account. This paper suggests that even where there is bidirectional violence then the women sustain more damage both physically and emotionally.
I would argue strongly that how much physical strength a person has does influence the impact, not just physically, of violence. I would never use physical violence against my daughter as she has so little strength against me. It's a situation of unequal reciprocity and to use it to my advantage would be wrong. If she tries to hit me then it doesn't cause me any fear or disturbance at all, even if she managed to physically hurt me (My aunt once had her nose broken by her 3 month old daughter, for example). So, the two different levels of strength are really important to the outcome - not just the physical hurt inflicted, but the emotional impact.
It's not just me that thinks that. The law can take into account the potential threat of violence from one partner to another. So, my friend whose ex-H leans over her, shouting in her face and screaming abuse can get a restraining order against him, even though he hasn't actually hit her. When she has physically pushed him out of her house and shut the door in his face, he hasn't got a legal right to get a restraining order against her, because there is no credible threat of violence there. In fact, it could be argued that this is an example of unidirectional female to male violence as she pushed him out the door, and all he did was shout. Was she being abusive? I would say she's acting in self defense. Was he being abusive? I would say he is deliberately intending to intimidate and scare her.
And again, other aspects have to be considered. My friend who pushed her ex out the house did so after years of not being allowed to go out, have friends, work and even being sulked at for having a dog. Now the ex is withholding funds, damaging her property and threatening their son. But he hasn't actually hit her. If she lost her temper and hit him, would that be her abusing him, or just desperate to make him see her as a human being, not some object?