Originally Posted by
Steely Glint
Except... not. It really just highlights what a fantasy it is. Even in an example where there did happen to be someone else with a firearm at the right place and time (which almost never happens), the shooter was still able to shoot 27 people before the other guy was able to intervene.
I am not aware of a single example of one of these mass shootings being stopped before they got going by a civilian with a gun, and if there were such an example (lets face it, the data set is pretty large so there might have been), that would still be just one success against dozens of failures.