So the bottomline of what I'm trying to say would be: if you exclusively consume mainstream news, you're probably more vulnerable to adhere to a narrow viewpoint, and maybe not even know there are people who disagree.
Similar to how HN operates when discussing a blog post, especially clickbaity posts -- when reading the comments you may see that there's more to the story or that the author is wrong about something. Sometimes that has helped me get a more nuanced perspective on a specific topic.
This is why “Q” claimed to be a high-level government official, for example, to attempt to establish authority. Pretense, or just experience or expertise or authority, is always there even with the stuff on 4chan.
The authority of a source is a shortcut for evaluating the truth of a source’s information. I think this is what @t12hrow meant by the question of practicality. It takes a long time to verify information on it’s merits alone.
This twisted argument seems to be claiming that 4chan is more trustworthy because it’s less trustworthy. But you’re demonstrating a double standard. If you can excuse and overlook the unending ocean of fake news and propaganda and bullshit on 4chan, then it’s only fair and consistent to do the same for mainstream news, where it’s also true that not everything is propaganda. You’re whole complaint boils down to you writhing against the “pretense”, but why does that matter, exactly? You either care about the truth or not, so the reputation shouldn’t be a factor for you, especially if you seek information from disreputable sources.