Mill on liberty

I just read the first two chapters of Mill's On Liberty which will be the topic for tomorrow's module. Mill also takes the fallibility argument as the basic argument as Locke did in his letter but he develops a totally different theory on toleration. In letter, Locke mainly analyses the irrationality of religious intolerance and persecution from the point of magistrate. Certainly, Mill also does not claims a right of liberty of discussion from the side of victims but holds a more impartial position. Mill's defense for liberty of discussion is based on the fact of mankind's fallibility and the value of diversity. First, the silenced opinion may be right for we are not infallible. Second, the silenced may be a portion of the truth even if they are errors. Third, even the received opinion is the whole truth it still need to be contested by opposite opinions, or else it will be a dead dogma. Forth, the dogma will prevent new mental development. The argument is in utilitarian style.