I am having trouble understanding your logic behind your argument that guns save lives.
A gunmen "killed five people", using as the name suggests, a gun.
"The incident in Salt Lake City is merely the latest example of how an armed
citizen saved the lives of innocent people"
The incident in Salt Lake City is ALSO an example of how another armed citizen has taken the lives of innocent people.
It is also stated that "at least three American massacres have been stopped by civilians with guns". Once again the massacre began with a civilian with a gun.
If people weren't allowed to have guns there wouldn't have been any deaths in the first place.