I am not trying to be rude or condescending here, but I think we can all agree that the media (ALL media) are in it for profit. It would seem, viewership is increased with controversial stories.
Kids dying, gang violence, crime in general, etc.
The news, especially local news, around the country I dont believe is very interested in law-abiding citizens doing law-abiding things. It doesnt create viewers, increase circulation (apparently, judging by their tendencies).
I believe armed citizens successfully avoiding and/or defending themselves, their property and their family happens rather often. Three members of my family have told me stories of them having to brandish weapons in order to avoid dire situations. Those situations, I guarantee, did not make the news for the consumption of everyday Americans.