so who taught him the rules to carry?

[mcantar18c]

I'd much rather threaten someone with my gun than actually have to shoot them.

Read: "I'd much rather let a potentially violent, deranged person with obvious disregard for the law, who now knows where I live, know there are firearms and maybe other cool things he can get a lot of money for on the street in the house and then send him on his merry way with a potential grudge against me."

That could be an invitation for future problems for you, and is likely a guarantee of future problems for somebody else down the road.