Lets look at gun control as oppose to the top reason, income inequality.

[Kasz216]

RoryGamesFree said:
it's gun control...plenty of nations have huge inequality but nothing like the same level of gun crime, doesn't take a genius to add 1 and 1 and get 2.

I think you underestimate income inequality in the US.  Additionally, gun crime is a meaningless statistic.  Total crime, or total homicides, that's different.  (Parts of Africa of course shows the folly of looking only at gini coffiecent.  Far more equality but so what.)

That said... Homicide rates