[Manuel_D]

I would be even more be supportive if the political sides were reversed. Imagine a Trump White House was threatening social media companies, and pressuring them to restrict posts on climate change, civil rights, or some other progressive cause. Why wouldn't I support it if the political sides were reversed?

The First Amendment doesn't just protect people from being imprisoned by the government for their speech. It also prohibits the government from pressuring or coercing private individuals and companies into censoring content. Otherwise, the government could just pressure private entities into doing whatever censorship they want. This isn't a ban on speech, this is a ban on government coercion.