At some point it's that fuzzy line between damaging discourse and the validity of the initial speech and losing context. Death threats, while increasingly and rightly talked about, are almost a classic example. Personally I think law enforcement agencies do a poor job of providing real life consequence to harassment and endangering of people's lives, speak nothing of angry hate speech. It's an interesting question though because ignoring the bigger issues with state control over internet in terms of censorship, a ton of horrible things get posted to internet services all the time that need moderation. Photos and videos of torture, beheadings, rape, and so on down the line that get moderated by third party companies.
Keeping internet free can mean a lot of things but so it can in the physical world. Freedom is an important value in modern society but one which usually shouldn't be absolute because it doesn't play out well. For as much as police systems are subject to corruption and a whole host of issues, when dealing with populations of a certain size, the institution itself becomes necessary in order to maintain some amount of peace and accountability. As such policing is inherently tied to law and other systems and so with freedom comes that execution concerning law and rights. As it happens, the internet is an imperfect derivative, caught somewhere between the current jurisdiction of physical life and more anarchic freedom.
The way I see it is that freedom on the internet as a value can only take us so far since we don't successfully operate that way in real life. The internet can and has been liberating, vital, disruptive, important, enlightening. But in all that vast space, there's also a lot of opportunity for hate, violence, damaging content, and all the ugliness that comes with people being able to do stuff. I don't know if all that ugliness will go away but I have to imagine we come up with a better compromise to address the cost associated with human interaction without sacrificing what's valuable about it.
Exactly the answer I was looking for. Very well put, thanks.