Jackthehat hit it on the head, I think - Switzerland is but one of several European countries with very high gun ownership but in those countries the rate of gun crime is very low and gun related crime injuries are as low as nil. The US psyche is dangerously disposed to settling anger/differences in a violent/lethal way and the mindset even shows in the use of words: "Hit the switch", "Kill the engine", etc. They are inclined to admire brute force by individuals the way some nations are drawn to getting involved in warfare.
Yes, there are vested interests, clubs, pressure groups, etc. who are on a sort of crusade regarding "freedoms" and will not have restrictions on gun ownership, including a conspicuous father-son pair. The son killed his younger brother with a heavy rifle, went to jail for years but an appeal is in the offing after some evidence of a flaw in the gun's model. The father actively advocates gun ownership, just regrets not having had a gun safe. People like that insist guns don't kill, that only bad people do. They refuse to see a connection with the unrestricted access to and possession of lethal weapons.
Nuclear bombs don't kill, bad people do. We have the USA (who used a nuclear bomb, twice, to in a single moment kill huge numbers of people) the only nation to offensively use such a weapon, crushing millions of Iranians (Iran does not have nuclear weapons so has never used one, neither lethally nor non-lethally and they insist they don't seek any) in the pursuit of supposed prevention. Something odd here, the proven bad people acting as an international policeman having unilaterally abandoned the deal over Iran plus the deal over nuclear missiles. The USA is the lead character in both the gun crisis and this nuclear anomaly. It's the psyche, or what ?