Again, I'm not disputing access to guns increases gun deaths - I vehemently agree with that. What I'm saying is there's a high likelihood that a combination of variables, namely: access to guns, income disparity and cultural diversity all correlate to and influence violence and murder in the USA. It's an overused example, but Switzerland has a massive number of guns around (not ammo, though, so it may be a separate thing to consider) but no gun deaths. Do they have income disparity? No, not really. Do they have cultural diversity? Almost none at all.
Interestingly, the UK doesn't have as entrenched a legacy of slavery, racism and exclusion...does it?
The point I'm making is, take cultural diversity, access to firearms, broadening income gaps, a history of unresolved racial schisms and throw them into a pot and what do you get?
Take away a couple of those variables and the picture becomes different. But the question is, which ones can and will the US government act on? None of them.