And the [likely politically deliberate] regularity with which this has been happening for years makes me very uneasy to read articles by the same outlets crusading against "misinformation". This movement isn't about combating misinformation, it's about combatting their misinformation, and ensuring that people only see our "true" information
It is simply too much of a coincidence that all these false stories about Donald Trump got published, yet any negative story about Joe Biden, e.g. the Hunter Biden scandal was thrown down the memory hole.
Well, it's hard to put my finger on a specific lie. Even if I did, you'd (plausibly!) argue "That's just one article!" Luckily, there are plenty of hard data out there about how the American people have been misled.
One great example is the Trump tax cuts. 64% of Americans got a tax cut, of whom 40% were convinced that they did not! [0]
Our media is incapable of informing the people about a matter of simple arithmetic!
[0]https://www.nytimes.com/2019/04/14/business/economy/income-t...
40% of 64% is 25%, which doesn't sound like a lot. That's a lot better than how many people don't know that Obamacare and the ACA are the same thing[1].
You're also not mentioning that the individual tax cuts begin to phase out in 2021, and end completely in 2025. Whereas the corporate tax cuts are permanent (until the next tax act, at least).[2] So some of those people may have been taking future taxes into account too (unlikely, but possible).
1. https://www.businessinsider.com/poll-obamacare-affordable-ca...
2. https://en.wikipedia.org/wiki/Tax_Cuts_and_Jobs_Act_of_2017
With you up to here. This is not exactly a new development though.
Everything else in your post is disputable or dubious but I feel that I have little chance of changing your opinion on that.