Not sure I agree with the parent poster, but I think he/she is well aware of the distinction you're drawing, and says so up front. Certainly, legal freedom-of-speech protections don't require Kickstarter to host any particular content. But Kickstarter can still espouse freedom of speech as a value they try to uphold in their practices, even if they're under no legal obligation to do so. I think as more and more of our online interactions move to hosted platforms, we have to decide as a society whether or not we want the hosts of those platforms to police our speech. Those spaces can either be free-speech spaces or safe spaces, but probably not both, and there's a legitimate discussion about societal norms to be had about where we want that balance to fall, independent of this particular rather-icky example (and let's face it: most examples that bring this discussion to light are probably going to be icky).