A deformed and withered left arm and a troubling childhood that left the Kaiser with serious mental health problems is more the reason for WW1 than the actions of Gavrilo Princip.
That is very likely.
A lot of European tension was the result of German armament driving an arms race and a desperate hunt for allies.
And that, particularly the Naval part, was the Kaisers doing.
Like a crab deprived of one claw, the Kaiser saw his right arm grow tremendously strong & longer than it might have otherwise been. He easily brought down flying game by raising & firing his gun with one hand; he took sadistic delight in dealing bone crunching handshakes with his finger rings turned inward for greater painful effect.
And yet Queen Wilhelmina of Holland was such a close friend that the Kaiser spared the Netherlands from invasion in 1914-18; it was she who gave him a mansion in Doorn following his exile from Germany. Strange. Maybe royal blood runs thicker than water, certainly more so than that of the millions who perished in that horrible war.