I think your logic is a bit off the mark.The good people carrying guns theory went to hell in Texas. Not only armed , but , with body armor , a nice swat armored truck and neat cowboy hats. They sat as little kids got turned into jello.
I am not anti gun but I most certainly do not buy that logic.
Point really is, that like in the case of that woman recently, IF someone is armed they MIGHT be able to do something IF THEY CHOOSE TO. Nothing says they have to.
Using the apparent poor performance of those law enforcement officers in Texas to claim what that woman did recently can’t happen, is illogical. It DID happen. And could happen again, and again. But only if a good person carrying a weapon happens to be there.