Generally speaking, frontline troops are usually brave enough, when it comes to facing the enemy. If they're running to avoid conflict in situations as ambiguous as in the Balkans, it's because they're afraid that they'll be in deep shit with their superiors and their own legal system, no matter what they might do.
And remember - the Germans haven't told the World Court to take a flying leap...
I think that you mean the ICC, not the World Court. We are signatories to the World Court too. They are different organizations. You point is well taken though.