Lets try again:
Every country classifies each crime in a different way. They call them other things.
A list compiled by the un is only COMPILED by the un not classified. It means that the nations are self reporting crimes in the way they themselves classified it to the un. There is no oversight.
Again if you were to run a true study you would take a place as close in culture, laws, geography as us as possible to see how things would work out if we did things the way others are suggesting. California has pretty tight gun control laws and they have the highest homicide rate and one of the highest gun homicide rate in the country. These crimes are all reported by the fbi using the same standards and classifications throughout all the states (besides for two). Thats called a fair study.
A small historical point: A duel, where you had two opponents shooting at each other, was a fairly common way of settling major disputes in the early days. Theres no hint of militias there. (I would not want to see a comeback of this practice. This is not what im defending.)