I believe GP's claim is factually accurate. The USA has the 4th highest homicide rate in the OECD, after Mexico, Turkey, and Estonia [1]. Roughly 2/3 of US homicides are using firearms [2]. After reducing the US homicide rate by a factor of 3, the US would still be 13th (out of 34) on the OECD list, between Portugal and France.

[1] http://www.businessinsider.com/oecd-homicide-rates-chart-201... [2] https://en.m.wikipedia.org/wiki/Gun_violence_in_the_United_S...

Which figures are you using to consider their statement absurd? I suppose the 'most' countries part is only true if you restrict it to the usually considered rich countries or 'developed' countries, but that seems like a reasonable restriction to make given the context.

I did a quick calculation based on probably obsolete numbers, but I got a homicide rate of around 4.8 per 100000 of which 2.7 are with guns, leaving 2.1 without which is still higher than most European countries. (check https://en.wikipedia.org/wiki/List_of_countries_by_intention... )