Different parts of the world have, you know, different perceptions because of different culture and history. For example, Nazi paraphernalia are popular in Thailand because they just aren't aware of how bad the Nazis are like Imperial Japan is. Speaking of Imperial Japan, try waving the Imperial Japanese flag anywhere in Asia and you'd be slaughtered immediately. The Imperial Japanese flag doesn't really elicit the same reaction in the West as the swastika.
So, I reckon that in South America, since they never directly fought against the Axis, the names of Hitler and Mussolini are trivial to them.