That’s literally what you said.
banning guns doesn’t actually reduce homicide rates if the nation has people who want to kill each other.
That means all first world nations with gun control laws “coincidentally” also have no people who want to kill each other (or disregarding the hyperbole, way less people who want to kill each other, which is still unrealistic).
And again, saying “because of their culture” makes no sense when countries with low homicide rates have drastically different cultures. Like, the only thing Italy and Japan have in common is probably the fact that they have a deeply ingrained organized crime, and I really don’t think that’s a factor that would lower homicides. Unless “their culture” means literally “not being the USA” I don’t see how it holds any ground.
Care to mention a first world country with no gun control and low homicide rates? Or one with gun control but high rates? Because if you find none I really think it’s not a “cultural issue”.