He won't believe you, no matter how much evidence you provide. It could be a stack of studies as tall as Mt. Everest.<quoted text>
You're saying that it runs counter to logic because it runs counter to your expectations.
I think in the US that there's a very common myth that carrying (or owning a gun) makes you safer. I would strongly encourage you to look into the data on your own.
If you've got a portal to access academic papers, I'm more than happy to grab the address for you.
One or two anecdotal incidents from either his own experience, or that of a friend of a friend, would be enough to cast the data aside as irrelevant.