The core here is that answering the question of "did the site decide to take an unreasonable political stance?" vs "did the user decide to take an unreasonable political stance?" is not as black and white as you would like.

The answer is going to be a moving target. You're gonna have some government bureaucrats having to make rulings on these regulations.

And many of the proponents of this seem to fail to imagine a world where Donald Trump is ever not president. Imagine the power this would give the government against someone who plays fast and loose with 'facts'. "We've decided that the statements in this post were intentionally misleading, therefore they are a political statement, and the owners of the site promoted them in a way that they didn't do to this other post, therefore the owners are making a political statement and this is not a neutral site, which makes it liable for these other comments from other users that we're interpreting as violent threats."