before World War 1, the world was very angry and everyone wanted an excuse to start a war.
On June 28, 1914, Archduke Franz Ferdinand and his wife decided to go on a ride in an open topped car into enemy territory to check up on a few things.
They were so excited they even wrote about it in a Bosnian newspaper!
Our enemies just told us exactly where and when they will be in town!
A group of angry Siberian nationalists saw this and came up with a plan to assassinate them!
After many random acts of chance, Garvillo Princip shot the archduke and his wife. A month later, Austria-Hungary declared war on Serbia, starting the first World War.
I believe this event did not abide by the just war theory because the Archduke did not have much real political power, making a world war unnecessary. Also, no citizens were at risk and many of the other countries who joined were not at risk either, making joining the war unnecessary and therefore unjust.