Suggesting that free speech advocacy, which has a very long tradition that predates contemporary social divisions, "echoes" the "propaganda" of "hate groups" is simultaneously meaningless and pernicious. You're drawing a line between free speech and "hate groups" while in the same breath denying that you're even doing so. In the process, you're not only inventing a nefarious association where none exists --- because causality flows forward through time, not backward --- but also completely ignoring danjayh's central point, which is that the definition of "hate" depends on the objectives of those with the power to define the word, and that machinery to suppress "hate speech" becomes, ultimately, a vehicle for reinforcing existing power structures and delaying needed change.

> Furthermore, free speech claims in favor of hate speech ignore the real material costs in human lives that facilitating hate speech incurs.

What material cost? Censorship advocates continually assume that hate speech must have large and personal costs, but in my experience, present no evidence. The benefits of censorship are not apparent. The costs, however, are clear in the historical record: slowed scientific progress, emotional distress, and atrocities that might have been avoided through vigorous public discussion. And it's always been in the name of the public good, or saving souls, or protecting the innocent, or some other unassailable and noble good that people with power have forced others not to say certain words. The idea that no, this time, it's different suggests a certain historical hubris.

I'd wager that throughout history, there's never been a society that's made its people happier or better-off through censorship. I'd love to see a counterexample if you can find one.