Serbia carries some blame for the way Great War blundered into motion. But that wouldn't have mattered if the Great Powers hadn't all decided that going to war was preferable to the alternative.

Small countries and organisations can do things that provoke big countries - but the decision to respond to that by going to war is virtually always the big country's.

"It was all his/her fault for provoking me" is no kind of defence in court, and it shouldn't be in international affairs either. We are all responsible for the things we do outselves, and should acknowledge that responsibility.