Physical violence, even among family members, is wrong and against the law. Alcohol, drug abuse, stress, and mental illness cause domestic violence. Abusers often say they use these excuses for their violence. Domestic violence is rarely caused by mental illness, but it is often used as an excuse for domestic violence. Domestic violence is a personal problem between a husband and a wife.
Domestic violence affects everyone.
About 1 in 3 American women have been physically or sexually abused by a husband or boyfriend at some point in their lives. If it were that bad, she would just leave. There are many reasons why women may not leave. Not leaving does not mean that the situation is okay or that the victim want to be abused. Leaving can be dangerous.