Because the fake news liberal media don't publish those stories.
Lol and what are the so-called real news sources waiting for?
Link to these mythical real news organizations??
So in your mind, no news organization is “real” yet you believe stories of a good guy with a gun are being suppressed despite a complete lack of evidence of such a thing. You do realize how dumb you sound right?
Local news organizations run them. The corrupted lying puke national liberal media won't touch them. Go do something useful lib fix Chicago where dozens are shot each week in your liberal war zone and YOUR fake news remains silent.
There was a lot of media coverage of the guy in Homeland, Texas, who went after the church shooter there and is credited with saving a lot of lives because the shooter left the church when this guy arrived and the good guy followed him in his car when he left but he was ex-military, and knew what he was doing.
There were people with guns in the movie theatre in Aurora, Colorado, but because of the strobe lights the shooter was using, and the smoke bombs and the general chaos, they couldn't tell what was going on of even if there was mroe than one shooter.
Unless you have military/police training, it's not likely that you could take on an active shooter effectively. It's not as easy to shoot someone as they make out in the movies. And when the police arrive, how do they know you're a "good guy". You're just another asshole with a gun, shooting at people.