IThis psychological phenomenon is an established fact and your attempt to refute it demonstrates a lack of knowledge on the topic, or is an example of the phenomenon in action. Quick read here:
Why many people will vigorously defend their beliefs even when faced with compelling proof they are wrong.
www.google.com
For what its worth, I hold libertarian and objectivist leanings and strongly believe in the first amendment, so social media censorship makes me very uncomfortable. My wife and I have talked about this a lot over the past few years. It actually turns my stomach. That said, these platforms are very powerful and it's reasonable for
private companies to want to reduce bigotry and baseless propaganda. Of course I do acknowledge there are some examples of them overreaching and the government should not censor books, tv media, etc.