To the OP.
1) Please document all about this atrocity in an academic way. In particular, take great trouble to list and credit all your sources and references. You see, so many people in the West just don't know about Serbian history. In fact most of us just thought that Yugoslavia was just a single country, and didn't know it was a nation of "bundled together" countries. It all came to us as a surprise When Tito karked it and the nation's stresses and strife were revealed to us... We didn't see you at your best because your civil war broke out and many incidents worse than war-crimes took place. You all even gave rise to the phrase Ethnic Cleansing. I don't imagine that all Serbs behaved all pure and innocent either.
2) It's not that we don't care. It's just that we only have a limited capacity to care about anything outside our immediate family and community and country. That capacity has become so stretched nowadays that we truly struggle to mange to care about more things. Even so, we are subject to a constant bombardment of adverts asking us to care and contribute to causes far and wide. We hear little or nothing about the former Yugoslavia nowadays. Although when it was all going on, there was loads being reported in the news media. Yet some of it was so horrific, that it wasn't revealed to the mainstream populace. All this demand made of us to care ever more has led to a backlash where negative comments are increasing commonplace. Such as; "it's time they sorted their own countries out, instead of always approaching us!" And many other such comments spoken with distain and even hatred.
3) Just a few years ago, I spend almost a year working with a Serbian. He was a very good bloke and a near perfect employee. He was so "proper" he wouldn't do a thing wrong. I suspected he was always frightened of any consequences. In fact only a few of us there even knew he was Serbian. One day I said; "Den dobry" and he answered "Dobro jutro" prompting me to enquire; "you what?" Most people thought he was Polish, but that could just be the sort of "racism" where everyone East European is considered to be Polish.
4) Remember too that some of our own fairly recent history has become disregarded. For example, The Korean War. Also known now as "the Forgotten War". So, if you and other Serbians don't document this genocide while you can - it will be forgotten...