simon:Здесь подробно описана эта проблема и на федеральном и штатовском уровне
Switzerland has a stunningly high rate of gun ownership — here's why it doesn't have mass shootings
The country has about 2 million privately owned guns in a nation of 8.3 million people. In 2016, the country had 47 attempted 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.
https://www.businessinsider.com/switzer ... ths-2018-2
Кстати говоря, из 8 млн. населения Швейцарии, более 2 млн. - это иммигранты из различных стран мира, в том числе, и из тех, где с законопослушанием дела обстоят намного хуже чем в самой Швейцарии.