Tankosic wasn't acting as an army officer, his side-projects regarding the Black Hand never had the approval of the government or the generals.
I'm unaware of there being hard evidence in what capacity Tankosic acted. He could have done so either as a terrorist or as an army officer. Tankosic himself never said which hat he thought he was wearing at the time, and it really doesn't matter anyways - no professional army officer can ever take off their army hat.
Acting as an army officer would be his personally safest bet - if Tankosic had supported Sarajevo as a terrorist, he was more likely to face a firing squad. So the real question is, did Tankosic have the authority to act in May 1914 as an army officer?
I agree that the war was almost inevitable.
But the Serbian government was not, in fact, looking to fight a country five times larger,
The Serbians were biding their time until Austria and Russia were at war, at which point I have but no doubt Serbia would have attacked Austria. Vienna must have realised this and decided to attack Serbia before Russia could give Belgrade the luxury of attacking Austria from behind.
which is why in July they took all steps they deemed even remotely acceptable to forestall such a war.
Then show me the police report the Serbian minister filed with the chief of police in Vienna on June 6th, 1914 naming Princip, detailing his band's armaments, and their probable intentions in Sarajevo.
Even after heavy encouragement from the Russian ambassador Hartwig and Poincare's support, they only went as far as accepting "only" 9 out of 10 of Austria's requests.
The French minister reported on 24 July that in the first draft the Serbians had practically swallowed the whole note without reservation. Somehow, from that, the Serbians managed to get within 24 hours to a note where they had rejected or evaded 7 out of 10 Austrian demands.
Discounting Franz Ferdinand's dubious credentials as the "leader of the peace party" (I believe that, other than Istvan Tisza, few in A-H's leadership can be called that),
Franz Ferdinand was the leader of the peace party and Conrad led the war party. Killing Ferdinand had the predictable effect of giving the power to guys like Conrad.
I was actually talking about how the Chief of Staff was heckling the government for a "preemptive" war against Serbia as early as 1907, while Ferdinand was still alive and kicking.
Maybe Princip should have had the brains to kill Conrad instead.