It make sense but I am sorry I have to tell you that I would be saddened about members of ANY nation (including Serbs) who killed people (absolutely any people) for the purpose of trade of spare organs.
People kill each other every day anywhere for different reasons but this is something much more sinister then just "simple" killing. At least to me. I wondered if it is so for Europeans.
Especially as Europeans were all in arms (and rightly) about rapes and killings that Serbs did...
If Europeans do not have equal disgust for these horrific crimes then it's a definitely prejudice against Serbs.

According to the article in Ha'aretz, the suspects also include Israelis (Zaki Shapira again) and Turks, hardly anybody's group (taken as a whole) of bad guys.