Actually, I understand your point. It's good to be prepared for situation like that, but those situation wouldn't be a problem if guns weren't around in the first place. It doesn't work that good in there, there's a ton of news about people getting murdered.
More guns does not cause more murder. In fact, it is the opposite. You won't care for these links, but some might. The murder rates in pre-firearm England were much higher.....until small pistols (fusils) became cheap and widely available.
Contrary to conventional wisdom, and the sniffs of our more sophisticated and generally anti-gun counterparts across the pond, the answer is “no.” And not just no, as in there is no correlation between gun ownership and violent crime, but an emphatic no, showing a negative correlation: as gun ownership increases, murder and suicide decreases
http://www.law.harvard.edu/students/orgs/jlpp/Vol30_No2_KatesMauseronline.pdf
http://extranosalley.com/?p=44540
http://www.theacru.org/harvard_study_gun_control_is_counterproductive/
http://www.pewresearch.org/fact-tan...y-after-decline-in-90s-suicide-rate-edges-up/
http://truthinmedia.com/crime-rates-in-chicago-plummet-after-il-implements-concealed-carry/