In case you wondered …

… The Case for Hate Speech - Jonathan Rauch - The Atlantic. (Hat tip, Dave Lull.)

The restless process of trial and error does not allow human knowledge to be complete or perfect, but it does allow for steady improvement. If a society is open to robust critical debate, you can look at a tape of its moral and intellectual development over time and know which way it is running: usually toward less social violence, more social participation, and a wider circle of dignity and toleration. And if you see a society that is stuck and not making that kind of progress, you can guess that its intellectual system is not very liberal.