You didn't listen to the podcast, did you?
Germany didn't have the choice not to fight France. France had decided to wage war against Germany, in support of their ally Russia.
https://en.wikipedia.org/wiki/French_Third_Republic#First_Wo...
"France entered World War I because Russia and Germany were going to war, and France honored its treaty obligations to Russia.[58]"
Not that Germany wanted to wage war against Russia either. Germany declared war against Russia because they declared war against Austria which had declared war against the Serbs who had assassinated their archduke.
http://www.history.com/this-day-in-history/first-world-war-e...
"The event that was widely acknowledged to have sparked the outbreak of World War I occurred on June 28, 1914, when Archduke Franz Ferdinand, heir to the Austro-Hungarian Empire, was shot to death with his wife by the Bosnian Serb nationalist Gavrilo Princip in Sarajevo. Over the weeks that followed, Austria-Hungary blamed the Serbian government for the attack, hoping to use the incident as justification for settling the problem of Slavic nationalism in the tumultuous Balkans region once and for all. However, as Russia supported Serbia, an Austria-Hungary declaration of war was delayed until its leaders received assurances from German leader Kaiser Wilhelm II that Germany would support their cause in the event of a Russian intervention. ... Russia declared its intention to back Serbia in the case of such a conflict, Austria-Hungary went ahead with its war declaration against Serbia on July 28, one month after the assassinations."
"Germany warned Russia, still only partially mobilized, that to continue to full mobilization against Austria-Hungary would mean war with Germany. While insisting that Russia immediately halt mobilization, Germany began its own mobilization; when the Russians refused the German demands, Germany declared war on the czarist empire on August 1."
I don't mean to imply that Germany or any country is blame-free, but WW1 doesn't feature any clear cut good-vs-evil simplification the way WW2 does.