I am no expert, but here's my viewpoint. About the only things you can do to survive if a person running amok comes in and starts shooting is either run and hide or put the offense on him, or maybe some of each. You have nothing to lose if there is no escape. I hope no one here ever runs into a situation like that.
Lazs makes some good points, and has more experience then most when it comes to rough customers. I respect his experience and opinion very much. It's easy to forget there is a lot of evil going on in the world, because most of the time we deal with nice people. We are taken by surprise when evil things happen. It is difficult to be on guard all the time as well, but it is necessary to do the best we can.
My thoughts are based on what I've heard over the years from people who I believe to be knowledgeable. If someone is out to get you they will try. There is a saying: To be forewarned is to be forearmed. Realize if someone is really after you, they will probably get you. Always take a death threat seriously.
On a different level with different motivations, thugs and muggers are opportunists looking for easy marks. They are as Lazs described, either after money or to harm you. Things you can do to avoid thuggery is give the appearance you are moving about with purpose. Don't go about looking like you are lost or aimlessly walking around. Don't look down at the ground or appear depressed. Give a healthy and robust appearance, like you are in shape and capable of handling yourself. Avoid places where trouble might happen, such as rough bars or bad parts of town. If you see an unsavory looking group headed toward you, cross the street and use that sidewalk. Avoid public intoxication where you might be unawares of what's going on around you. Keep an eye peeled in parking lots and at the gas station. Lock your car doors and keep windows rolled up. If bumped from behind, look to see who is in the car that bumped you before stopping and getting out to inspect damage.
Couple random thoughts:
Fighting a mugger who wants your wallet is not such a good idea. Sometimes a mugger may set you up by asking if you have a light, then mug you while you have your hand in your pocket. If he's after your wallet, take out the wallet and toss it on the ground in front of him. Do not hand it to him. He will more likely be distracted or run off if he has to pick up the wallet and it's scattered contents from the ground. This may give you time to get away as well.
Don't display a gun to a would be aggressor unless you are willing to kill him. It may happen that a would be aggressor will not be deterred by the sight of a gun. If this happens and he walks toward you, you must not allow him to get your gun or to harm you. You may have to shoot him, even if he is, or appears to be, unarmed. This would be a very hard thing to do for most folks including myself.
Carrying is very serious business and requires a serious attitude and a great responsibility. I haven't met Lazs but he sounds like someone worth knowing. From reading his posts I would feel perfectly comfortable around Lazs.
Les