This "you're just a conspiracy nut" perspective for looking at actual networks of power and sources, became common after journalism pretty much died with local media as they shifted to ownership from a few parent conglomerates all working for elite interest.
Now news is about "ideas" and "events" not key players, money and networks of power ultimately benefiting the richest that kan in turn easily sway public opinion without resistance through PR, think tanks and media ownership.
I don't know when you think this rather beautiful "sincere belief in ideology" became the primary driver of history and politics, to me that's a highly naive after a bachelors in History and a love for the pretty standard historiographical realpolitical and resource oriented lenses adjacent to works like Guns, Germs and Steel.