Domestic violence affects the victim. Domestic violence affects the children in the home. Domestic violence even affects the perpetrator. You were probably aware of this. After all, some of these affects are of course the legal issues you or someone you care about are now facing charges of assault with a domestic violence designation. What you may not be aware of is that domestic violence has negative effects over all of society.
One way that domestic violence affects society you can probably already guess. Many incidents are going to end up involving the police, the courts with all its personnel, hospitals and doctors, treatment facilities and perhaps even other services. Of course any time that these people need to give their services to deal with a domestic violence situation is less time they can be working on something else that would be just as needed. As all these services are among the most desperately needed by society you can see how in just this small way that domestic violence is harmful to society.
There is also, as mentioned above, the effects on the participants. It has been shown that domestic violence victims have much higher than normal tendencies to have physical problems like ulcers and heart problems, mental problems like depression and PTSD and social problems with relationships. Although not as much has been written on the topic it has also been shown that the effects on abusers mirror those which victims suffer from. In every incident of domestic violence there is a likelihood that it is creating two people who will struggle to fit in with society and some will no longer be able to be productive. Two people may not sound like enough to worry about, certainly not enough to affect society but realize that this is occurring in thousands of households.