I know I sound like some cold-hearted bastage, but I am also older and have a few decades of experience under my belt.
The key point here is that your gun gives you absolutely no special LEGAL powers you had before you started carrying a gun. If you wouldn't run across the street to break up an argument at a gas station before you had a gun, strapping one on and using it to do so now is likely not a good idea. In fact, you are in a far more dicey position as you could introduce lethal force into a situation you know nothing about, and be charged with a felony for your trouble. How well can you provide for and protect your family from prison?
If I wanted to be a cop, I would have gone to the academy and earned a badge.