Well,poor communication is among the most common causes of domestic violence.
When you look at communication in a different aspect,like in solving one of the couples disagreements,when applied effectively,they will solve their issue properly with no escalation of words or physical altercation.
Then when there is no communication at all or there is no effective communication,where no one is listening to another or there are things to be shared out between the couples but they tend to ignore them,or nobody wants to understand the other,it will reach a point where there might be verbal, physical or emotional attacks which would have been avoided by just effective communication.
Also,incase of a heated argument that might result to physical,its better to walk out and give the other party time for them to calm down,which might bring them back to their senses and call for a better ways to solve a problem
In other words,as much as there might be soo many reasons out there that cause domestic violence, some can be avoided using simpe effective communication and lending other a listening ear.