Howard Nemerov has some excellent analysis of the UN’s gun data, and notes that it does not jive with their purported agenda of small arms control. I did some quick analysis of the same data about a month ago, but Howard’s is more thorough. I did not have time to look at suicide data, but he did and found no correlation.
International comparisons are always difficult because of how different countries measure crime. One must always be careful not to assume correlation is causation, but that’s never stopped our opponents from drawing conclusions that make them feel good.