any act or omission committed within the framework of the family by one of its members that undermines the life, the bodily or psychological integrity, or liberty of another member of the same family or that seriously harms the development of his or her personality
I would recommend the following book: Tremblay, R. e., Hartup, W. H. & Arger, J. (Eds) Developmental origins of aggression, New York, NY: Guilford Press.
Tremblay, R. E., Gervais, J., & Petitclerc, A. (2008). Early learning prevents youth violence. Montreal: Centre of Excellence for Early Childhood Development.
I think it comes from a deeper and diverse place that we cannot always fathom. The same situation may invoke violence in a person, while another person may deal with it differently.