> That's been the status quo up until now, but it doesn't have to be. We're moving towards orwellian style censorship at a breakneck pace with SV leading the charge.
Very few people actually want such a site arrangement. Believe it or not, I have no interest in interfacing with people who want to kill me unless they are open to honest and rational debate, which few are. One of the reasons I enjoy Hacker News is because I know won't have to deal with the type of people that will frequent the fringe elements of the style of site you are advocating for.
Also, I'd hardly call a business led moratorium on speech advocating terrorism and genocide "moving towards Orwellian style censorship". Absolutely nothing is stopping these individuals from standing up their own server and hosting this content themselves. They aren't banned by an ISP. Moreover, business owners should be allowed to express their opinions too, including who to do business with.
Ublock origin (in advanced mode), umatrix, and noscript each enable this functionality. Umatrix has the best UI of the three once you get used to it in my opinion. Go on YouTube and look for "the hated one" for great tutorials on JS blocking with umatrix and ublock origin.