So this was the latest event -
Seven people were shot inside of a Carson City, Nevada, IHOP. Four died on scene. The gunman, Eduardo Sencion, as often happens, died of the self-inflicted wound to the head. Same story, different characters and location. What was telling about this one is a statement made by a witness to the event.
"The owner of the BBQ across the street had a clear shot of him walking into the IHOP after he killed the lady motorcycle rider but didn’t take it, citing "it was a pistol against an AK, what was I going to do?""
Now, I will bet this article is going to be super controversial. But in the vast majority of these events, the bad guy will either kill himself when he is done, or is eventually captured by the victims who could not take it anymore and charge the gunman while he is distracted in some manner. But until either one of those things happen, the killing continues.
There are arguments about inaction due to uncertainty, and fear of getting into aftermath trouble with the authorities. I would submit that the image of a man shooting people with a rifle is fairly conclusive and informative about what is going on. There are also arguments about getting involved. The usual story goes something like “I carry my CCW to defend me only”.