There are many possible explanations.
- Alcohol is often used as an excuse for violence
- The perpetrator may struggle with feelings of inferiority and powerlessness
- There may be a family history of violence
- The perpetrator may suffer from low self-esteem and mental health issues
- In some contexts, violence is seen as an accepted method of regulating interpersonal relationships
For more insights, see the Danish National Board of Social Services website (Socialstyrelsen) in Danish