Domestic violence is never okay.
In fact, it's even indicative of more violence. In 54% of mass shooting cases, the shooter has harmed a spouse or other intimate partner. While we should probably put laws in place to prevent incidents like that, naysayers will always point out that you don't need a gun to cause damage.
That's technically true, and one case in Fairfax County, Virginia, is an insane example of domestic violence and its effects.
Police in Fairfax County were called by a family member who came home to find a 76-year-old woman being attacked with an ax by her 70-year-old husband. The family member was able to save her from the onslaught, and a struggle for the ax ensued.