It's not sufficient to have a gun. You really have to know your surroundings, you need to know how many assailants you're facing, or you need enough backup that it doesn't matter.
Here's an example of a gun getting someone killed. The guy tried to help, but didn't realize that there were two assailants, and it got him killed.
http://www.nbcnews.com/storyline/vegas-c...rampage-n127361
Snake oil.
Here's an example of a gun getting someone killed. The guy tried to help, but didn't realize that there were two assailants, and it got him killed.
http://www.nbcnews.com/storyline/vegas-c...rampage-n127361
Snake oil.