Then you'd need to have Yugoslavia under occupation first. It is not that easy to try virulent nationalists in virulently nationalistic places.
Yeah, but Milosevic wasn't a nationalist. He was basically just a opportunist who wanted to hold onto power first and foremost. In fact, he used the REAL 'virulent nationalists' such as Arkan and Seselij as boogeymen. He basically said to the West. 'Look, who would you prefer to deal with...me or them?' In fact, Milosevic was probably more of a communist than a nationalist.