Many people fear the moment when an argument gets out of control and their partner suddenly becomes violent. They might try to hurt you or use a weapon and the only way to stop them is to use self-defense. Even if you acted out of self-defense you can still get charged with domestic violence.
Domestic violence is a very sensitive subject in America.
The term "domestic violence" is sometimes used as a synonym for assault or abuse. But it's also a legal term, with a precise definition under Washington law.