I think you may be confusing the UDHR (Universal Declaration of Human Rights) which is non-binding. By comparison the ICESCR and ICCPR are binding, and they are actually higher than state laws, the majority of nations have not only signed but also ratified them. Any contraventions of the treaties can go all the way up to the international courts, but certainly can be tried at lower courts as well.
In terms of Freedom of Expression, at a global level it is absolute, since as Biden says torturing people to death and selling off their organs to prolong the suffering of their bodies is “cultural differences” instead of genocide.
Sure maybe on a national level you may live in some kind of evil dictatorship which will torture to death for thinking or expressing the wrong thing, however there are countries in the world that will not do that. So considering that the Fediverse is International, then Freedom of Expression is absolute, since it can not be based on “lowest common denominator”, as that would require everyone to get an electroprods and electrocute themselves for having thoughts contrary to the CCP’s preferences, or those of any other socialist nations which limits free speech.
All major world religions recognize a God which is most merciful and most compassionate, there are many names for this God of Love (God, Allah, Avalokitesvara, Sat Nam, Brahman, Jesus, etc). I know this is Very upsetting to socialist nations (thus the torture camps in socialist nations to stamp it out).
In Canada our constitution is founded on the principles of the supremacy of God. Thus one must always side with whatever is the most forgiving/merciful and compassionate resolution to anything. Thus all expression is allowed. So if we Do have any kind of fediverse governance, it will have to honour the international treaties.
Canada helped draft the UDHR and many of the treaties such as the ICESCR and ICCPR. Like I said earlier Treaties are actually higher than national laws, they are also the only thing that governs international organizations such as the Fediverse.
I’ve been on the Fediverse a while, and I’ve never had any issues with anyone. Sure there are some spiritual children that lash out in anger, or post pro-authoritarian stuff, but with some conversation of forgiveness, compassion and unconditional love they learn to be kind and gentle with themselves and other people.