TexasCHLforum.com

There's a lot that goes into the decision to carry a gun. There are some things you will need to reconcile with yourself before you do. There might come a day when you have to pull that gun to defend your life or someone elses. There might come a day when you have to actually shoot someone and they might die. I'm sure there's more than just those two things, but those are two pretty big ones and something you gotta consider before getting a gun for self or home defense and then carrying one. For myself, I haven't had to shoot anyone yet nor have I drawn or even shown my gun to stop a situation the OP describes. However, I have drawn my gun when I came home once and found my front door wide open and knew there might be someone inside that I might have to shoot.

I suppose one other thing to consider and it's been said here before in a metaphor mentioned by more than just a couple of people and that's just because you have a gun doesn't mean you have to use it. I think the metaphor goes something like when you have a hammer all problems start to look like nails at some point.

In the OPs scenario, showing a gun might have stopped the crazy person's rant and sobered then up a bit. Maybe not. The display of a gun, the threat of deadly force, would have been justified by the OP in this situation. However, IMHO, the police should have been called regardless of the outcome and this person reported and arrested.