I seem to remember that in the end there were more civilian casualties from US high altitude bombing than there were "genocide" victims in mass graves.
I believe the death count from our bombing was in the 1,500-2,500 range depending on who you believe (the media, NATO, or the Serb government at the time).
There were about 500 civilian casualties over the three months of bombing & 14,000 strike sorties; about half of which were Kosovar Albanians--overall our Air Force, Marine, & Navy pilots were precise, professional and careful.
The Former Republic of Yugoslavia Ministry of Foreign Affairs came up with 495 deaths. The decidedly unfriendly-to-America Human Rights Watch came up with 488-527 bombing deaths; closely corresponding to Belgrade's 495. Go to para 53.
As to victims of Serb ethnic cleansing, there were many more than 500. There are 2300 Kosovar Albanians still missing, although there are pretty good indications as to what happened to them.
Not to mention the 1000 Kosovar Albanian bodies found in a mass grave in Serbia proper where they were transported by order of Milosevic in an attempt to clean-up the crime scene. And then there's the thousands of other Kosovar Albanian victims of Serb ethnic cleansing found in Kosovo itself.