Intentional homicide is just a small part of the picture.. The dead doesn't care about whether it was intentional or not; he's just as dead whether shot through planned murder, affection murder, manslaughter, suicide, by the police, or an accident.
Then there's the little problem that what each country defines as intentional homicide differs. Are executions by the government intentional homicide, for example? Or casualties of internal warfare? What about cops shooting suspected criminals? Or doctors turning off life support?
But anyhow, comparing the US shooting rates to the countries we are the most similar to, in culture and economy shows that the US is far from being one of the safer places, and our high rate of weapons allegedly for protection doesn't appear to protect us all that much.
When I moved to the US a generation ago, one of the things I had to learn was to fear guns. This was a new experience. And statistics say that as an unarmed person, I'm more likely to be shot by the police or someone legally owning a gun than I am of being shot by a criminal with an illegal gun. Chew on that one.