Liberals went into journalism after World War II because they wanted to tilt the country to the left, after seeing the horrors of the war.
At the same time the Soviet Union was infiltrating American society with Communist agents. Joe McCarthy was excoriated at the time, but with a decade it was obvious he had been telling the truth - the government and seats of power were riddled with Communists, and we got our ass kicked by a pissant Southeast Asian nation.
Richard Nixon was the the process of extricating the nation with honor from Vietnam but then the establishment took him down with Watergate, which was an obvious bullshit set-up.
Nixon's political demise proved the subversives in the U.S. could manipulate internal politics, and especially after that the numbers of left-winger who went into journalism skyrocketed. I was a freshman at and Ivy League school in 1975, I saw that process first-hand.
People like me, who believe in God and our country, go into community journalism, but mainstream journalism is so far gone it is hopeless. There's no way for it to be fixed - it's all leftists and heathen.
It's like when you joke that you would remove the rust from your jalopy, but the rust is the only thing holding it together. If you purged the godless and the damned that run the mainstream media today, there would be nothing left.