We Hold These Truths
When applied to events or actions in the near past it likely does not only not harm free speech, it is free speech. However, when applied to events or acts that took place years or decades ago it should be judged in the context of those times not by modern morality. Confederate statues, for example, would be seen as standing for repression of blacks if the statues were erected a decade or more after the end of the Civil War, and those erected in the first part of the 20th century were explicitly made for that purpose.