Over at Spiked, Dolan Cummings, co-convenor of the Battle of Ideas, makes his (excellent) case for freedom of speech.
...to argue for free speech is to make the case for free-thinking, reasoned debate and genuine tolerance. It is also to put forward a particular understanding of how society functions and the role of individual and collective agency, which is very different from the fearful and conservative worldview that gives birth to censorship and taboos. Instead, it is a worldview that allows for the possibility that things could be very different, and that human beings could be the authors of our own destinies. Rather than seeing change as a threat and seeking to contain discord, we can talk openly about the future, exchange ideas and argue over them rather than trying to suppress those that make us uncomfortable.
Freedom of speech is not merely a means to an end, then, or a rhetorical trick. It is an invitation to live a free life.