I think it's a bit of a stretch to get from security is good to therefore, we should have a widely armed citizenry.
There are other ways to secure life and property that don't require a widely armed citizenry. That being said, I'm not opposed to having guns in schools or church. Most churches I know of, including my own, have a police officer on the premises during worship. Same for schools.
I'm of the opinion that we need a "Shooter's License" the same way we have a Driver's License. When I was in the military, I was not authorized to handle weapons until I was properly trained. If at any point in time I went to counseling or took any psychiatric medication, I would've been suspended from standing an armed watch. My point is that training, education, and safety is deeply embedded into our culture when it comes to driving cars, but when it comes to guns, they are just treated as property. Both guns and cars are lethal, so why not have a Shooter's License? The military knows this to their core, but the general population does not. There is a disconnect.
This would allow the issuing entity (most likely a sheriff's office) a chance to screen people, which makes way more sense than gun control policies that are aimed at restricting firearms. An AK-47 in the hands of a good person is a good thing, an AK-47 in the hands of a bad person is a bad thing. The AK-47 in and of itself is neither good or bad; but that is how some politicians are (wrongly) characterizing it.