Well, given that state breakdown, I think the right conclusion is that there are simply more murders in the US than other developed countries across the board, no matter how you slice it.
(Yes, comparing rather marginal differences.)
However, Venezuela is on a completely different level. Moreover, murder rates in the US are heading downwards; they are half of 1980's numbers. Venezuela is radically up, almost ten times of 1980's numbers.
Face it, the US done fucked up.
(However, breaking up Belgium brings to mind some controversies: the motto of the country is "Einigkeit macht stark" or "Unity makes Strength"; after the 2010 election (June 13, 2010) it took 541 days of negotiations to come up with a functional government (sworn in on December 6, 2011).