Never voted democrat, so I don't consider myself a democrat. I readily admit to being liberal on social issues.
I think you're still missing the point. These are companies that just don't want to be singled out because they allow hate speech, or provide a medium for the crazies that go on rampages to post a manifesto, etc.
At the end of the day, they make money with advertising, etc, and just don't want to be associated with the s of society. For that group, the internet is big enough, and has a low enough barrier of entry where they can probably relocate.