Oh, and, with respect again to oursin's comment, I have found it necessary to stress to many people that you can't sin by accident. This is a categorical impossibility. For sin to be sin, you have to know on some level that you're doing wrong, and do it anyway. Admittedly this is shifty in the case especially of ideologically motivated sins, where people often convince themselves they're doing the right thing, but I do think on some level someone like Milosevic had to be aware that all those deaths were a sign of, at the very least, suboptimal choices.