You're assuming that domestic abuse rates among cops dropped along with the total. I have seen no reason to believe that. In fact, the study you just linked said that only about half of domestic abuse is reported to the police. If your abuser were a police officer, do you think that would make you more likely or less likely to report it to the police? They protect their own.

A lot may have changed in 35 years, but I have no reason to believe that this did. These are people who have been trained to use physicality to enforce their authority, and their use of force has continued to be grotesquely excessive despite knowing that people (including themselves) now carry HD cameras everywhere. If they can't help themselves when they know that they're being recorded, what do you think goes on behind closed doors at home? I know that I'm also making an assumption here, but I guess the core of our assumptions is that you believe that cops learned how compartmentalize their aggression to only be activated when they clock in and I believe that they're class traitors who generally don't learn basic humanity, let alone psychological techniques to expertly manage their emotions far beyond what average people can and do. But who knows, maybe you're right, maybe they only beat the shit out of strangers who don't deserve it and never their spouse and children who also don't deserve it. It wouldn't be the first time cops were good at discriminating.

ACAB.