Vile human scum who indirectly caused virtually all the evils of the 20th Century and a bloodthirsty Serbian ultranationalist like Milosevich to vote.
rofl
The GREAT MAN 'theory' of history really needs to die.
Yes really.
ANd more to the point why do we blame this random Serbian teenager when we could easily blame the incumbent archduke for itching for an excuse to kill more Serbians, the powder keg of alliances that was set up between the superpowers of Europe in the preceding decade that made such a major war a possibility to begin with, or how about we blame the sandwich maker at the cafe that Princip stopped at before the Archduke and his crew decided to go down the wrong street (Princip's successful assassination was actually possible because of several other botched attempts at the Archduke that happened like literally twenty minutes before he shot the guy and the Archduke decided to go to the hospital to visit the wounded people from the bomb attempt).
Hell, none of this would've been possible if that Idiot King Pekah didn't conspire against the Assyrians.
The problem is that road leads you down another dangerous path in history, that of things being destined to happen the way they did. Often that is not the case and another individual would produce a different result. Would any other Tsar then Peter have modernized the way that he did? Would a General other than Washington have managed to achieve the same success in the Trenton-Princeton campaign? So many events that changed the course of history occured because of the creativity and individual choices of people. I think that, whilst it cannot be the sole factor, it cannot be eliminated entirely.