As with hate speech, the harm needs to be quantifiable. "I don't like that people are sharing ideas and opinions that I personally disagree with" doesn't cut it.
The price of freedom of speech is needing to hear things that make you uncomfortable every now and again. Deciding what people can and can't write on the internet is a slippery slope.
The German government already has their own mastodon instance on social.bund.de
Much better alternative to a EU funded social network, as this would automatically drive critics to the assumption, that politicians are controlling the narrative and deleting critical content. Also supports the development of open source and self hosted alternatives this way.