but here in reality that doesn’t actually work as long as humans remain what they are
Ceaseless cooperation in numbers beyond those of our immediate tribe- or family-sphere is not a trait that is found in humans.

"reality" is what capitalism has indoctrinated you to think it is, meanwhile in actual reality, humans are and always have been hardwired to cooperate

and there is no outside disruption from anywhere else that doesn’t subscribe to the ideal

lol, so you acknowledge that attempts at communism couldn't have succeeded because capitalism wouldn't allow it (because capitalists consider communism, or any cooperation that isn't for profit, an existential threat, which is precisely why they invest so much in to making people like you think it's not only a bad idea, but an "impossible" one).

https://medium.com/international-workers-press/misconceptions-about-communism-2e366f1ef51f

You can try as hard as you like to evade actual reality, and the fact that capitalism is not only guaranteed to, but is already literally destroying humanity and the planet, or you can keep licking its boot that is not only stomping on your neck, but on all our necks, because you're too scared or even unable (but definitely privileged enough to still find comfort in it - we aren't all that lucky) to think outside of the box it created for you, but falling for the propaganda will never make you right, only demonstrably easily manipulated, and wilfully ignorant and resistant to change (when you refuse to even try to understand, let alone seriously contemplate the alternatives, you don't get to dismiss them since you clearly don't know what the fuck you're talking about).. That's a you problem, not a communism (or even "reality") problem.. ¯\(ツ)/¯