We all live in a society that functions the way it does (for good and bad) because we have some shared foundational beliefs in something like democracy. While I have mixed opinions about digital censorship in general, it should not be surprising for a (quasi)democratic society that values free speech to silence those in power who would encourage large groups to question those core values.

This is especially true since western society regularly tries to interpret and judge intent along with what people say, and it has judged that Trump's intent is self-serving and not an honest disagreement, and as a result it has deemed it at least somewhat acceptable to censor him.