That study is extremely misrepresented. It looked at household conflict rates, but the internet imagined that every act of violence was perpetrated by the officer, and not the spouse. In fact, the study found that the spouses of officers reported a higher rate of aggressive acts against their spouses, than officers did against their spouses.

The researchers also didn't conduct these studies on non-officers in the same location, in order to determine a baseline rate.

You also have the fact that "violent behavior" was not defined by the researches, so it left everyone to use their own personal definition. Maybe people thought violent behavior was yelling, or slamming doors. Is that domestic violence? Maybe, but I think when most people hear domestic violence they imagine a man beating up his wife.

And then there is the issue that these studies only involved a few hundred people from a specific location, like 40 years ago.

Fine, but where are the studies showing the conclusion is false?