Calling the police and even attempting to intervene are admirable actions, and I do not have a problem with that. But, as has been well-stated here, the police cannot simply make an arrest because you called the police to report a POSSIBLE DV. As has been explained, they must have probable cause to believe that a crime occurred and that the person to be arrested committed the crime. You do not know what the police saw or heard when they were there. While it is possible that they were lazy sots, it is more likely that they were unable to overcome the legal barriers towards an arrest and, instead, were left with either a report of a verbal argument or a log entry (depending on the reporting requirements for such matters in OR).

