"A good guy with a gun"

[RickHworth]

With all of the very recent mass shooting events, one thing seems to be missing from these news "reports".
Where is the "good guy with a gun" narrative? Truly, this should be easily demonstrated. (except those that patiently waited outside the classroom in Texas)
I put this in the same vein as those that praise the iron lung in the height of polio in this country, absent the vaccine.

[KPN]

1. Hell yeah. How many firearms are owned by citizens in the US?

Somewhere between 345 and 440 million? More than one per person, and the majority of Americans don’t personally own a gun. Where the hell are all the frigging good guys they bugle about?! Hell, there’s probably at least 70 to 100-120 million gun owners with an average 5 or 6 guns each, Where the hell are they every frigging day? Seems like they are only shooting innocent people so far … every single frigging day!