But for some reason, the letter itself is not incorporated into this article.
Possibly because it is just another communication from one of Conrad von Hötzendorf's allies in the Dual Monarchy's armed forces recommending preventative war against Serbia. Potiorek was the commander of K-u-K forces in and I believe the governor of Bosnia and Herzegovina. He certainly wouldn't have been given that post if he didn't agree with Conrad's views about Serbia. The Balkan Wars of 1912-13 led to Serbia doubling its size and having its prestige in the Slav world greatly elevated since Serbia was seen (correctly) as the driving force in organizing the Balkan League and setting the war against the Ottoman Empire in motion. Serb battlefield victories against first the Turks and then the Bulgars when the latter suddenly attacked its allies to attempt to grab a bigger slice of captured Turk territory brought even more prestige to the Serb Kingdom. Conrad kept agitating for a military solution to the threat a large and powerful Serbia posed to the Dual Monarchy as Serbia would never be content unless Bosnia and Herzegovina were made Serbian.
There is no big secret here. Conrad kept rattling his saber and his allies in the Army did likewise. Franz Ferdinand was as unimpressed with this clamor as he was with Conrad's other pet rock, a preventive war against Italy. In this the Emperor and his heir Franz Ferdinand fully concurred in spite of the otherwise frigid relationship between the two men.
Franz Ferdinand continues to be subjected to frenetic abuse in certain Serb circles, not because he was a ‘bad man’ but because his likely policy when he ascended to the throne would frustrate what these ultra nationalists most wanted, A Greater Serbia erected from the debris of the Empire. Franz Ferdinand was a very clear eyed and opposed opposed Holzendorf’’s preventive war schemes as foolish and deeply dangerous to the very existence of the Empire. Instead he looked forward to incorporating the Slav peoples, especially the South Slavs of the Empire as the Third Nation of the Empire, co-equal with German Austria and the Kingdom Of Hungary. To do this he planned on shearing off the Slav portions of Hungary and incorporating them with Croatia and Bosnia and Herzegovina into a Slav Kingdom of the Empire.
This is why Serbs hated Franz Ferdinand.
Franz Ferdinand grasped that to have any chance of bringing this realignment withing the Empire about he would need a number of years of peace firmly opposed all military adventures on the part of Austria-Ungary while at the same time pressing for enlarging and modernizing the Empire's military establishment. There was no contradiction in policy here. Ti be able to carry out this major reorganization of the Empire Austria-Hungary would have to be formidable enough to discourage Russia and its Slav allies from trying to use force or the threat of force to thwart this reorganization. So Franz Ferdinand simultaneously wanted Austria -Hungary to be powerful and allied closely with the greatest military power on the Continent, Germany while pursuing a pacific and nonthreatening foreign policy. Very unfortunately for Central Europe and the entire world the boldness of Franz Ferdinand brought about his murder by terrorists belonging to a secret organization ‘the Black Hand’ within the Serbian Army intelligence bureau. The assassination at Sarajevo led to World War 1 and the destruction of the European world.