Can you name 1 time it has lead to disaster? I can easily name 1 time it hasn't.
Switzerland
While being the most heavily armed country in the entire world, http://www.crimereduction.gov.uk/statistics/statistics35.htm than England (and Wales), United States, Australia, Canada, Netherlands, Scotland, and Sweden.
Maybe the Swiss are just very relaxed people, but there doesn't seem to be any correlation between lots of guns and lots of crime.
Crime and stats aside, how am I supposed to defend myself without a gun? I'm 5'8", I'm only about 140lb, I'm not a black belt, and I don't have magic powers. If you take away my gun, I'm basically left to be killed by any thug who feels like breaking into my house. Call the cops you say? It takes 5 minutes to kill me. It takes 40 minutes for the police to show up. I would say do the math but there is no math, only a dead me when police show up 35 minutes too late.