"But their downfall was their brutality as evidenced by Srbrenica and the shelling of Sarajevo. "
I agree that Serbs on whole have made the most war crimes, but they weren't alone.
Also there were fights and war crimes between Muslims and Croats, it would be silly accusing Serbs for that too.
And jihadists in Bosnia have been doing the same to Serbs as ISIS is doing today to ordinary people of Syria&Iraq, I don't justify reaction of Serbs but I partially understand it.