I think you should just turn in your guns to your beloved police; they will care and protect you from all harm.<quoted text>
If someone is in dire jeopardy, then intervention would make sense. But you have to be absolutely sure that the person you are defending is not the perp. And heck, the person pointing a gun may be an undercover cop. And interfering can get you charged with obstruction of justice. Even the spouse who was the victim of a domestic might turn on you and help out her abuser. Again, something to think about before you intervene.
Something to think about.