Argentina has the highest percentage of people of German ancestry in Latin America, and people of German ancestry are actually the fifth largest ethnic group in the country.

You nailed it though, Germans and other Europeans have always emigrated to Argentinia, it’s one of the reasons about a thousand officers of the German high command escaped there post ww2.

But as other have noted in the thread, plenty of Nazis made their way into a normal, very comfortable life in the countries that made up the allies. Not like Argentina was special, the country just already had a decent German population already.