I think most people have never in their life read an article by a journalist about something they're knowledgeable of that wasn't complete dogshit. You mention

I think most people have never in their life read an article by a journalist about something they're knowledgeable of that wasn't complete dogshit. You mention Glenn Greenwald because presumably you're not an expert on state-level corruption. Pretty much any piece of journalism on any topic you can poke plenty of holes in with some research. Hell some articles you can use the article itself to disprove the main point the journalist was trying to make. At some point overwhelming empirical evidence can elevate a "cocktail story" to a rule of thumb.