I don't think it's a realistic concern that FB would block content from mass-market media for political reasons. They might block it for copyright, but there's no benefit in deplatforming material that's already been seen by tens of millions of cable viewers.
My problem with Facebook is that it acts as radicalization pipeline by channeling lies that are too crazy for mass market media into the minds of people who are susceptible to believe them.
For a recent example in America, Facebook was used to spread propaganda to Republican rural residents in Oregon by telling them that Democrats were coming to light wildfires in their towns. Oregon rural people responded by setting up their own vigilante checkpoints.
It goes without saying that the claim that Democrats were coming to set rural Oregon on fire was a lie, but that lie spread like wildfire through Facebook, and it was a lie that could have very easily resulted in fatal violence.
To make matters worse, many of the too-crazy-for-mass-media ideas spread on Facebook are the product of astroturf propaganda and are not organic. The problem is not people sharing videos of Tucker Carlson, or even individuals spewing racist diatribes; the problem is well-funded right wing propaganda groups using Facebook to distribute material that encourages people to hate--or even kill--their fellow citizens.
While I agree that judges should make the ultimate decision on what is acceptable speech, the judicial system just isn't fast enough to respond to the speed of Facebook-propagated propaganda. Society needs a better solution; we can't wait for a perfect one.
Facebook is pouring gasoline on the fires of social division. This is not just unethical but is extremely dangerous to social stability and it ought to be stopped.