Because when 100% of the people have guns, not even idiots want to try and shoot you!
The country has about 2 million privately owned guns in a nation of 8.3 million people. In 2016, the country had 47 homicides with firearms. The country's overall murder rate is near zero.
The National Rifle Association often points to Switzerland to argue that more rules on gun ownership aren't necessary. In 2016, the NRA said on its blog that the European country had one of the lowest murder rates in the world while still having millions of privately owned guns and a few hunting weapons that don't even require a permit.
But the Swiss have some specific rules and regulations for gun use.
Business Insider took a look at the country's past with guns to see why it has lower rates of gun violence than the US.