Or are there some other 'universal' rules that exist and that were disregarded by Radovan Karadzic and his accomplices?

You're trying to rant at a crowd containing lots of people who would cheerfully drag Bush x 2, Blair, and a collection of EU leaders and a load of their minions into the same court for assorted war crimes. We'd also throw Putin in the dock, along with pretty much all the leaders in ex-Yugoslavia. You're not likely to get much sympathy for Karadzic. The problem is not that he's being prosecuted, it's that other people aren't.