This is just another version of the "Jews sacrifice Christian children" method of generating hatred amongst a group by telling them they are being targeted by another group.
Unfortunately, it has worked all too well amongst the groups in the Balkans leading up to their various wars, but, given the lack of hard data to support the claims of what was going on in Kosovo in the 1980's, there's really no good reason to repeat those claims today.
The Kosovar Albanians have their myths about the decades leading up to the war, just like the Serbs, and if you want to go on about how the Albanians were being 'ordered' to kill and rape, then you have to deal with the Serbs poisoning Albanian schoolchildren, but at that point, it has ceased to be about facts, and become a mere hyping contest between opposing victimhood mythologies.