[claudiawerner]

Here's an excerpt of an argument by Marcuse (by no means the only one to argue against Mill, in fact there are philosophers who question the entire justification for free speech, and I think they have a more interesting point, though they don't directly address Mill):

>Now in recalling John Stuart Mill's passage, I drew attention to the premise hidden in this assumption: free and equal discussion can fulfill the function attributed to it only if it is rational expression and development of independent thinking, free from indoctrination, manipulation, extraneous authority. The notion of pluralism and countervailing powers is no substitute for this requirement. One might in theory construct a state in which a multitude of different pressures, interests, and authorities balance each other out and result in a truly general and rational interest. However, such a construction badly fits a society in which powers are and remain unequal and even increase their unequal weight when they run their own course. It fits even worse when the variety of pressures unifies and coagulates into an overwhelming whole, integrating the particular countervailing powers by virtue of an increasing standard of living and an increasing concentration of power.

(From https://www.marcuse.org/herbert/publications/1960s/1965-repr... published 1965.)