Well, I remember such a discussion we had in my senior high school World Cultures class back in 1985 where there is a logic which goes, “one man’s terrorist is another man’s freedom fighter.” I know in the grand scheme of the Universe, there is good and evil so I’m just bringing this up for discussion. I’m of Serbian heritage myself, my last name points to where I’m of Kosovar Serb decent. Princip, myself, I can’t say if he was a hero or zero, I’ll let each person decide for themselves, but we cannot deny that he did change history. I think Princip should have been the “Man of the 20th Century” due to the influence of his actions. Even so, if it was not for Princip, some other man, people or event(s) most likely would have presented the casus belli for World War I at some point.
My own view of WWI was that it was a powderkeg waiting to explode with many people eager to light the match. So could WWI have been avoided? Too many ethnic and social problems i.e. Russia, the Balkans. Too much tension for it not to explode. Too many powers eager to be the brightest star in the European galaxy.