You have to dig a little deeper. Swiss gun ownership is primarily guns owned by those in mandatory military service. The have guns, but most do not have ammunition with the guns. The majority of Swiss gun owners simply cannot shoot someone with their guns without first obtaining difficult to obtain ammunition.

Looking at the numbers alone is not enough. Just like looking at the US numbers alone doesn't really tell the real story. Guns are definitely part of the problem, but it's the rest of the culture and economic factors that tells the story of why the US numbers are so high.

Ammunition is not difficult to obtain in Switzerland. Essentially anyone who can legally possess a gun can buy it from a gun store.

Government-issued ammunition is difficult to take home, but there's plenty of commercial ammunition that will work in the government-issued rifles.

Maybe difficult was too strong of a word. There are plenty of barriers to obtaining both guns and ammunition, far more than in the US.

I don't know if it's fair to say that it's not the issue. Unless we have a crystal ball that will reveal the exact breakdown of causal factors, it certainly seems reasonable to address the big ticket items that we are aware of, and are reasonably sure will have a positive impact on the homicide rate. Let's not let perfect be the enemy of good when it comes to incremental social improvement.

> So this begs the question, if the per capita gun ownership in Switzerland is 1/4th what it is in the US, why is gun homicide 1/7th

Not every relationship has to be linear. Also there might be other factors. They might be easier to spot if you take away 3/4 of all guns in US.