There are definitely cases where speech can be harmful. It can affect people's livelihoods, personal lives... Rumours can (and have, many times) lead to actual

There are definitely cases where speech can be harmful. It can affect people's livelihoods, personal lives... Rumours can (and have, many times) lead to actual dangerous events, from the blood libel pogroms to pizzagate. Bad information about covid can (and are) leading to deaths. etc. In wartime, there is a reason belligerents use propaganda. If effective, it can literally weaken a nation. Freedom of speech is important, despite the dangers. In terms of political freedoms, danger & importance often go together. I don't think we should diminish the power of speech, and therefore its danger. As to abstract justice... This has been a major societal and political concern since the literal beginning of history. That is, for as long as there has been writing (that survives), there have been such issues. Ancient law codes, religious texts and such are full of it. It's part of who we are.