The existence of society demands this in practice. This is how humanity has worked at least since the beginning of agriculture, and likely long before that. Step out of line too far, and someone caves your head in. At best we can hope for is that the rock holder is accepting, and not a fascist.
You will find that it is impossible to create a society that does not exist in this manner. Since a society that accepts everybody also means it accepts people that don't accept everyone by means of violence, hence destroying a society that accepts everyone.
You're conflating actual violence and "viewpoints I dislike".
Yes every society will resort to vigilantism to protect itself in the absence of a policing power.
But death threats to someone because they made a tweet you disagree with or abusing your power as a bank to control speech isn't about protecting yourself from violence - though that excuse is often used.
It's a form of denial, of shutting down uncomfortable debate. It's an ideological sort of end, like a dictator who has a pathological need to execute his critics. The "inner ring" of acceptable opinions grows ever smaller - it has to. It's not about making the world better, it's about attacking outsiders and the beast always needs new outsiders.
>But death threats to someone because they made a tweet you disagree with or abusing your power as a bank to control speech isn't about protecting yourself from violence -
It's about causing violence. It's no different than "You happened to say something against our religious book, don't do it again or you'll get hurt".
Outsiders are a useful target because sometimes they are also the monster. This is the effect of existing in a reality with uncertainty. Accept everyone uncritically and you may be attacked by those you accept, this leads to fear, that fear is then manipulated by those that want power. There is no solution here, there is only the attempt to balance between malicious outsiders and malicious insiders.
You will find that it is impossible to create a society that does not exist in this manner. Since a society that accepts everybody also means it accepts people that don't accept everyone by means of violence, hence destroying a society that accepts everyone.