Domestic violence is one of the toughest things for police to deal with for many reasons:

  1. A vast majority of the time its he said / she said with no evidence.

  2. A majority time the violence is mutual with no injuries on both sides and no clear evidence of who started it. And what about cases where one person starts it but loses the fight? Who should be arrested. Good real life example I handled was where it was a heated argument and the guy called the girl the C word to which she slapped him. He retaliated by punching her. IMO both should have been arrested but thats severely frowned on and we are encouraged (aka ordered) to arrest the one who did the most damage. So the guy goes to jail while the woman who made the fight go violent gets off free.

  3. Nearly 95% of the time when you do have evidence to arrest someone the victim will recant and claim the police lied or made things up. Look no further than the Rueben Foster case in the NFL. He was arrested last year and the victim later recanted. The victim now claims she lied during the recantation. He’s since been arrested again but charges are now dropped. Big part of the problem is that she is a liar. You can spin why she lied, she says she lied because she loved him, but it doesn’t change the fact that she is an established liar with zero credibility going forward which makes prosecution without evidence impossible.

  4. Too many women report men for harassing / stalking them one week and then are back with them the next week. I’ve literally taken stalking reports one night and then gone to follow up the next night only to find the woman has made up with the man and they are back living together again and she wants the whole thing dropped. Then a month later she’s screaming “the cops did nothing when I reported him for stalking” after they have broken up again. Or I’ll give you another example I dealt with last year. Girl breaks up with guy. He freaks and is harassing her. She is driving home with a friend and he suddenly pops out of the trunk into the backseat as she arrives home. He knew the keyless passcode to her car so he entered and hid in the trunk to find out who she was out with. He goes nuts and enters her house and won’t let her in. I practically was begging her to press charges for stalking, unlawful entry, or something because of how concerned I was over the behavior but she didn’t want to because “I still love him, I just don’t want him to do this and I don’t want to ruin his life.” We had no victim, we only arrest against victims wishes on domestic battery, so no charges. A few weeks later he did beat her and of course we got the “the cops did nothing when they had the chance.”

  5. So often I’ve seen women get protection orders and then a few days later invite the guy to their home. Then a domestic flares up, we get called, and we find that she invited him there.

The case out of Utah is tragic but its hardly normal as there are all kinds of things about it that are way out of the norm for domestic violence cases (his background being one of them). The norm falls into things like I mentioned above.