Something that's important to keep in mind with murder rates is that they are tiny. That France's tiny number is more tiny than the US's tiny number is irrelevant. If you wanted to lower the frequency of unexpected deaths you'd spend all your time and money doing things that would encourage people to exercise more, or something like that.

Another thing to keep in mind is that murders are not random, whereas the other ways people die early often are pretty random (like car accidents). Regular Americans living regular lives have an effectively zero change of being murdered. Just ignore it.