Carrying a gun increases your risk to get shot: http://www.newscientist.com/article/dn17922-carrying-a-gun-i... http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2759797/
Saying that the cat is out of the bag so you need a gun is cold war logic were you need to be able to kill the other more times. So you rather want to escalate the situation further instead of trying e.g., what Australia did by implementing gun control?