(FWIW it's refreshing to actually see this being argued openly and honestly, instead of the usual "of course we support free speech, but ..." tripe.)
The parade of horribles presented as evidence is not particularly convincing, though, although bias (either way) can make a big difference here. But while we're at it, since the blog post mentioned the Christchurch shooting in 8chan context as an example of the case where censorship would be desirable, I want to talk about the censorship that happened after - specifically, the attempts to take down copies of the terrorist's manifesto that were floating around. NZ apparently had some emergency legal powers to criminalize distribution outright, which is bad enough. But the real mess was Australia; they didn't have any legal pretext to ban it, but there was a strong social consensus - among people who make decisions, anyway - that "somebody ought to do something".
So, the Australian ISPs made a synchronized private effort to censor it, to the point of domain-blocking several large forums where the manifesto was posted and not removed by the local admins (because it didn't violate their lax rules, nor local laws!), while the government caught up on legislation. Effectively, it was a private censorship cartel, and the citizens that didn't like the outcome had no recourse - not even the usual democratic mechanisms to repeal the laws etc, since there were no laws involved. This is the kind of stuff that the present non-decentralized structure of the Internet makes possible, and the inherent power makes it a near certainty that it'll be abused eventually, whether for cynical political suppression or a do-gooder witch hunt. I'd rather take my risks with more decentralization - some parts might stink more than others, but at least I'll have a choice.