Guns Are Well Behaved in Switzerland

So how do other advanced countries deal with high rates of firearm ownership by citizens?  Ironically Bloomberg of all places gave us a little insight.   

From Bloomberg: Shooter Kills Three Women in Swiss Mountain Village Spree

Of course this is a tragedy but read down to the final three paragraphs of the story...

"There were 241 deaths in Switzerland by shooting in 2010, compared with 408 in 2001, Ninety-two percent of those deaths in 2010 were suicides."

Murder is declining steadily in Switzerland, and...

"In February 2011, Swiss voters rejected in a referendum a proposal to ban citizens from keeping guns at home and require all guns to be registered."

To sum up the situation in Switzerland, a country of 8 million people:

1. 3,610,300 guns owned by citizens
2. 20 murders by shooting in 2010

To sum up the situation in New York, NY, a city of 8 million people:

1. 57,300 guns owned by citizens
2. 237 murders by shooting in 2012

There are 63X as many firearms in Switzerland as in New York City yet gun murders are 12X higher in NYC than in Switzerland.  

Why do the guns in North America have to cause so much trouble when their cousins in Europe mostly keep to themselves?