You seem to know an awful lot about this specific case, and I'll defer to you on that. I know about the general case, technically speaking (though merely a DNS hobbyist).

However, having a business relationship with another organization is not a right. Hate speakers are not a protected class.

DNS does not operate in the same manner nor with the same assumptions. One can obviously run their own DNS resolver as has been pointed out repeatedly in this thread.

Please list the, "pro-pedophilia and ISIS web sites." hosted by Cloudflare?

Edit: There's probably a business opportunity for a registrar/DNS provider/host that operates under 'free speech purism,' though it's hard to say it won't go the way of usenet in that regard.