I don't think you understood my point, whatsoever. It is not merely my opinion, it is how the world works.
Here, let me give you an example:
I claim that President Trump had a secret conversation with me where he confessed to treason.
Now, can i cite that sentence as proof of my claim? After all, i can link to it, repeat it- does that mean it's true? Accurate?
No, it doesn't. Human brains use a soft, iterative decoding. This means that we have limited confidence in our own ideas, and we improve on those ideas with new information.
We have become accustomed to using mainstream media as purveyors of truth. You can thrash and whine about this all you want, but claiming that any imperfection of mainstream sources opens the floodgates for us to all be on equal footing in terms of the authority of our claims is ludicrous. The reason we call them "mainstream media" is that they actually are better about sticking to the truth than the rest of us.
And "mainstream media" isn't a monolith. There are lots of different sources, competing with one another. They don't want to be factually wrong, they want to be right, and they try to keep each other in check.