Not so at all. Human nature can, and does change, albeit very, very slowly. Evolution exists; humans continue to evolve through natural selection. We have mitigated some of the environmental effects, in that people that would not have survived to reproduce a hundred years ago now survive and thrive, but we are still evolving.
Communism was the norm for 95% of the time humans have spent on Earth.
Yes, this I agree with.
Communism works very, very well when you know everyone. Communes still exist today, and they are wonderful places, because everyone knows everyone else, and is able to work for the common good. Bad actors are quickly recognized and removed. This is what is called a community; community is direct and personal, because each individual knows each other individual, or at least knows someone that knows that individual. You can still find echoes of this with civics clubs, certain churches (not megachurches), and other local chapters of national organizations.
But this is not what we have now. Society has replaced community. Rather than everything being personal, everything has become impersonal and depersonalized. (That this feeling of being disconnected is pervasive in society; it’s giving rise to right-wing extremism, as young people–mostly boys–looking for community are finding fascists that welcome them into a community. This is a large part of the reason why cells of groups like the Proud Boys are successful) Society is a largely external force, outside of the individual. In a society, problems are external to the individual; in a community, problems are internal to the individual, because the individual knows every other person.
Human nature can not keep pace with the ways that we are changing out environment. We have evolved to live in tribal groups, but in our development and reproduction as a species we have out paced the size of communities we have evolved to function within. Societies attempt to create a framework that allows individuals to continue to function, despite no longer being directly connected to the other people around them. Society has largely failed, and continues to fail to adapt in modernity; this is true for both capitalism, and so-called communism at a nation-state level.
For decentralized, anti-authoritarian communism to work, it must be personal and individual. You would need to evolve–or devolve–to tribal groups, or very small village-states. You could not have countries as we currently understand them, and we would certainly have a hard time e.g. coming to agreements about combating climate change (esp. when you consider that there are certain religious communities that are personally invested in denying that climate change is even real). Moreover, we have seen that there have been no successful transitions from communist revolutions to true communist societies yet. Is it possible in the future? Sure. But that’s not the way that evidence is pointing.
I don’t believe that capitalism is the answer; that’s failed to meet the needs of everyone economically, and has often failed to meet social needs. I don’t believe that communism can work the way that it was conceived; it may meet the bare economic necessities of most people (baring famines caused by hubristic governments or intentional genocides), but has failed the social needs. I don’t think that communism should be accepted or permitted in the way that it’s been implemented by Lenin, Stalin, Mao, Castro, or any of the other communist dictators due to the way that it removes the individual, personal autonomies and liberties of the people in those systems. (And yes, I’m aware that “dictatorship” is a loose term, and that even an absolute monarch doesn’t have unlimited power, but the USSR, China, Cuba, and others, have been effectively dictatorships.)
This isn’t a problem that can be solved through black and white, reductionist thinking–capitalism -OR- communism–and I don’t think it can’t be solved through pure theory. I tend to have a lot of respect for people that will admit that they don’t know what the solution looks like, while decrying both the communism that has existed as well as capitalism as it now exists. I have much less respect for people that insist that they know for certainty that this or thatwill work.