The anti-Second Amendment people will frequently claim that all you have to do is say, “I felt threatened” and you can get away with murder in “Stand Your Ground” states. Of course this isn’t true. But they believe it and of course, in their world view, their beliefs trump facts.
Larry Correia used to teach self-defense classes professionally and wrote up in great detail the legal criteria for legally shooting someone in self-defense. It should go in your list of links to send to those who think a license to carry is a license to murder.
The short version is someone must have the Ability, Opportunity, and Immediacy to inflict great bodily harm or death upon an innocent person before you can use lethal force to defend against them. I used teach Means, Opportunity, and Intent. But it amounts to the same thing.