Everyone, even extremists, deserve their freedom of expression protected  No matter how distasteful, or extreme, their opinions may be, everyone should have the right to voice them freely and publicly. That is the very essence of a free society. When groups presume to judge good speech from bad, and to shut off the channel by which the designated bad speech may flow, it abrogates its duty to protect the rights of all. When ISPs do this, which they do when they block sites they designate as extremist, they rob the people of their fundamental role as the final arbiters of acceptable speech in the marketplace of ideas, taking that power unto themselves without any form of democratic or moral mandate. Such a state of affairs is anathema to the continuation of a free society. [1] Speech can be legally curtailed only when there is a very real and manifest harm arising from it. But that is not the case here, where the participants are few and scattered, and those who would take exception to what the extremists have to say can easily opt out online. When extremists try to organize terrorist action online, then the government should step into protect its citizens. That duty does not fall to the ISPs.  [1] Chomsky, Noam. “His Right to Say it”. The Nation. 28 February 1981.