I am American and I see their point.
The former Yugoslavia has been carved up in the last 15 years to precisely the same configuration that Nazi Germany had for it during WWII. Germany was the first to recognize Slovenia and Croatia as independent countries in 1992. Germany has taken over the UN management of Kosovo, and German -- not English anymore-- is the second language to learn in the Balkans now. German allies are in positions of power and Nazi German allies (including the Bosnian Muslims and Albanians) are in favorable positions and those who opposed the Nazi Germany back then are getting screwed now. They are not wrong on this.
For years, the Serbs screamed about Kurt Waldheim being a WWII Nazi, and no one listened, but they were right. For years, Serbs screamed that Muslims are not who you think they are, and no one listened -- until 9/11. They weren't paranoid then and they aren't paranoid now.
Lest you think that I have some "racist problem with the Finns", think again. Although on my mother's side, her family came from Montnengro for as long as anyone can remember, I participated in the National Geographic genome project a few months back. On my mother's side, I come from Haplog U5, the same genes, race and blood as the Finns, and only the Finns. No one in the family can figure it out -- father's genes may or not be who they are supposed to be, but mother's genes almost always are. This is a major mystery to all of us! Somehow all my mother's mothers were from Finland and then were transported to Montenegro at some point in time that no one can remember.
Middle Ages slave sales ~ never forget that slavery was big time in the Balkans right down to the end of Turkish occupation.