There are certain buzz words or phrases in our society right now that cause outrage. Domestic violence is one of them. Unfortunately, the vast majority of the time, these instances warrant the outrage that automatically comes just from hearing the term. However there are undoubtedly things that we don't know that only the people on the legal teams do.
One documented thing from the start of this was that she was very drunk. Let's just say, hypothetically, that there's validity to the idea that maybe she was out of control and trying to get in the driver's seat and leave, or at the very least, something to put herself in harm's way. If you're a man what do you do? I guess in hindsight the answer is to "gently" stop her, but if you really don't put your hands on a woman under any circumstance, I guess the answer is to say well there's nothing I can do so best of luck. Hopefully you don't die. I don't know how the law works in other states but I'm almost positive Tennessee law requires one party to be arrested when a domestic call is made so to speak. So an arrest was going to be made no matter what happened really.
That's just one hypothetical scenario but my point is there have to be crucial details we don't and likely will never know, but my guess is that even though it's coined as that buzz phrase "domestic violence", something is known by other people that shows this isn't your typical "throw him to the wolves" case.