We argue about how it's okay for private companies to censor whatever they feel like, but what if it's the government pressuring them to do so? They themselves in this letter mention that 50% of Americans get their news from TV, and many American's have one choice of Cable provider, and even if they have 2 or 3, that's just 2 or 3 companies you have to pressure into delisting news sources of your choosing to make them essentially unreachable for the vast majority of the population.
The next step I feel is obviously blocking websites, again Americans only have 1 or 2 options of internet providers, and in this case they'd already have pressured them into censoring cable, so why not ask the same companies to censor the internet?
Steps like this just make me think that one side clearly doesn't plan on ever being able to lose an election again, and with actions available such as adding new states, adding 12-20 million new voters (illegal immigrants), I can see why they feel that way. Any authoritarian steps taken in democracy are usually balanced by the fact the other side could do the same when in power. If you simply never lose power, that's not an issue.