I think 4chan has gone too far on this one. They should ban neonazi propaganda. There is a big difference between allowing non-PC talk and allowing outright neonazi/terrorist propaganda. Besides, it is ruining the experience on all boards for all people.
I mean, I think it's horrible, but I can envision lots of functional and useful societies that are horrible based on my principles (how would you like to to be part of a hize mind?), but that doesn't make them bad in an absolute sense.
Scaled down, freedom of speech is to protect us from changing cultural and mob rule running roughshod over what we consider good and bad to the detriment of all. The law would basically just lag internet outrage by a few months or years.
Edit: This is meant to be interpreted in context, where a platform has taken a stance that it doesn't censor, and a government blocking that platform. I'm also not making a stance that anything goes, as speech inciting direct action against the law (or meant to cause a situation which is immediately and obviously unsafe) is problematic, and under what I take free speech to embody, which is freedom of thought and to express those thoughts. As absolutist as the first words sound, it's not really meant to be interpreted that way, but more as a call to acknowledge that good and bad are relative to the farthest degree, which is about as far from absolutist as you can get.
Edit 2: From closer reading, it wasn't actually a government request. The article notes that the government often issues these through the courts, but the ISPs acted on their own in this case.