I've worked with a domestic abuse agency for quite a few years. It doesn't surprise me that domestics flair up in TV. Literally, it can happen with anyone or anywhere. A "nice" couple can have their issues behind closed doors. I really think it's best never to have a gun in the house. When a man or woman goes "temporarily crazy" (of course, I never have)
haha, it is amazing what one can resort to.
http://www.theduluthmodel.org/pdf/PhyVio.pdf
This is a Power and Control Wheel. This rage of hers
could have escalated after years of "who knows what". Somehow, she went over the edge and unless we know the "inside story", we'll never really know.