If you think Serbia is the reason World War One started, you ave a very one-sided view of history. The actions of Serbs that might or might have not had connections with the Serbian government is what began World War One, but the war was going to happen anyway, while it might have started elsewhere. It was a conflict between colonial powers, newly formed powers without colonies, and old empires crumbling under their weight. For example, Britain was planning to take over German East Africa anyway so they could build a railway from Cape Town to Cairo.
Anyways, I have no particular stance on the matter, or who's right or wrong, I just thought your comment was kind of stupid. It seems odd to me that a person that obviously knows a lot about Germany and might be German himself thinks that a "deserved punishment" mentality is good, since that is what lead to World War Two, which I think we can both agree was a much worse comment.