I tell myself that it is because of some inadequacy in the abuser, and the abuse helps them fill it, combined with learning at a young age that this is how it is done. Jealousy plays a role. Feelings of inferiority and inadequacy can drive this jealousy, and cause the person to abuse someone.
I think that the lower the socio-economic status, the more likely there is to be abuse. So, in part, it comes from deprivation, or failure to meet expectations. But that’s not the only thing involved, because it does happen in middle and upper class households. Often, though, it takes a subtler form in upper class households: emotional and verbal abuse instead of physical.
In any case, when you feel like you are shit, worthless, with no skill whatsoever, there is an emptiness in you that makes you very, very angry. It seems completely unfair and wrong, and when we are frustrated, we tend to lash out at whoever is near. We rationalize it in one way or another. I think abusers who rape their children probably feel that children are property, or at least, less than fully human. Either that, or they had the same treatment when they were kids. I think that if you don’t have the education to be able to reflect on your own behavior, then you don’t have much chance of stopping yourself. You just “act out.” Act out your self-loathing, except instead of hitting yourself, you hit whoever is nearby and can’t or won’t hit back.
Ah, there are so many why’s to abuse. Some may be present in one case; others in another. But at the bottom, I believe there is always some inadequacy that is being acted out on the defenseless.
This always makes me think about what to do about it. I think it is one reason why parenting classes should be mandatory. Education is key for folks to recognize what they are doing. If they see what they are doing, they have a better chance of stopping it. Economic opportunity can be important, too. Psychological services for everyone, but that’s not going to happen. Maybe support groups could happen, maybe on a neighborhood level (I think in the old days, churches used to serve this function). Safe houses for people to run to; automatic belief in what self-identified victims are saying (although still to be verified because kids do lie when they are pissed at their parents).
I think community and education are the bastions to fight abuse. People are afraid and ashamed to bring these things to light because of the stigma involved in being a dysfunctional family. We need to find ways to destigmatize this behavior so that people can talk about it and correct it.