Read "THUNDER AT TWILIGHT" for starters.
You apparently are stuck with your opinion, that you read in one book, without understanding the entire picture; nor what preceded it all, diplomacy of that time, the complete player list, nor why that war could have been at the least, somewhat forestalled.
My little library of First World War books begins with Tuchman & Fromkin, includes MacMillan, Ferguson, Keegan, Mossier & Catherwood.
Today there are very few who still find the Great War controversial enough to debate, but there are still many who buy the German propaganda -- which Germans like Hitler himself believed -- that first, Germans did not start it and second, that Germans did not lose that war.
It's what drove Germans to Round Two in 1939.
In fact, by 1900 Germany was the great revisionist power, growing population, growing industrial power, growing cultural influence, growing military prowess.
And "lebensraum" was not something Hitler invented, it was around when Hitler was born.
So Fromkin's book "Europe's Last Summer" reviews the age overall and then reveals events between the Kaiser's High Command and Austria -- how Germans pushed reluctant Austrians into war and then responded to mobilization by Russia with a German invasion of... Belgium & France.
Sure, other countries played roles too -- by refusing to accept Austria's aggression against Serbia, or refusing to accept Germany's declaration of war against Russia, they expanded a small local conflict into global war.
But it all began with the Kaiser's High Command pushing reluctant Austrians to issue war ultimatums and then not accept Serbia's compliant response.
Fromkin's c2004 chapter titles:
Part One: Europe's Tensions
Part Two: Walking Through Minefields
Part Three: Drifting Toward War
Part Four: Murder!
Part Five: Telling Lies
Part Six: Crisis!
Part Seven: Countdown
Chapter 43: Shredding the Evidence
Part Eight: Conclusion, the Mystery Solved
Epilogue
Russian involvement would have made little sense.
Franz Ferdinand was the leading pro-Russian in his government; therefore removing him from the scene would have run counter to Russia's interests.
Of course his political views were misunderstood elsewhere, so perhaps they were in St. Petersburg as well.
Perhaps the extent of his friendship was not fully understood.
But as a champion of monarchism throughout Europe, surely, on fiercely held principle, the Czar would have opposed such a murder."