There is no potentially about it, the fault of WW1 lies with Serbia, Austria, and to a much lesser extent Russia. Germany was actually trying to prevent the war from spreading in the first place.
No, the argument is that anyone can for any reason enter any public space. And that if someone is attacked unjustly they have a right to defend themselves.
So the active murderers and rapists aren't responsible for their own actions?
How can you make that ruling?
Are you insinuating that if unattack Jasnah would have found some random bum and killed them?