Apparently you missed the part of the statement that says "More gun ownership corresponds with more gun murders across virtually every axis". I don't think you're destined for a career as a researcher Slobodan.
Maybe not a career as a researcher, but I know a thing or two about how to read and interpret a research.
Btw, the chart your provided clearly says "deaths," not murders, thus including suicides (which represent about 2/3 of all gun-related deaths). I responded with a chart that plots only murders. That "statement" you quote is just that, a statement, not a proof.
Ever heard of data massaging? While it might have a legitimate use, I am referring here to selecting data that supports your argument and ignoring data that does not. In case of your "research," it means looking for a set of data (countries) that prove your preconceived ideas of the end result.
Why that particular set of countries? Why comparing countries with vastly different history and culture? Most of Europe is based on serfdom history and mentality, with no guns allowed for its "subjects," in order to protect their kings and queens. The United States was born and expanded based on guns.
Barbados!? Qatar!? Really? Why not Bahamas, which happen to have the world's highest murder rate per capita. Great Britain? They murder with knives, so, obviously, their gun-murder stats will be lower. Etc., etc.
Besides, I provided a much more recent research, published by the National Public Radio (left-leaning in itself), with data from CDC and other official sources, that proves the opposite in the US: murder rates down 50%, gun ownership doubled, since 1993.
But if you want to play with choosing different sets of data, how about this: red line indicates a group of countries with practically the same gun-ownership rates, but up to five times higher murder rates. Or the blue line: the same murder rate, but vastly different gun ownership. There are several other horizontal and vertical line on that graph that I can draw, each time drawing a conclusion that suits my goal.