This is not a case of ‘I do not agree with what you have to say, but I’ll defend to the death your right to say it’. Rather, it is ‘I do not agree with what you have to say, but you should be able to say it because it’s too dangerous to stop you and you might have a point really’. Revolutions were never made of this.
Even a stopped clock tells the right time, twice a day.
There’s more, on the Popinjays.