Anthropologically speaking these statements about human fundamentals (or "human nature") end up falling flat. There have been plenty of societies organized in ways such that private property was irrelevant when existing at all.

I suggest "Debt" from David Graeber for a great dissertation of this topic (which is not the core topic, but definitely touched).

All of this without considering that private property of means of production is different from private property in general.

True communism has of course existed and likely still exists, but it's limited to small self-selected communities, like monastic retreats.

Communism indeed is highly unlikely to works as a political state system, due to human nature.

Safety-nets for big companies so they can't fail, shared ownership for rich shareholders. Dog-eat-dog market forces, rugged individualism and bootstraps for the poor. Don't you think it's weird that the things communist Americans want, are the things Wealthy Capitalist Americans get, while telling the poor "those things don't work"? Central Planning sounds like a stupid idea, but why are all the big companies planned from a central HQ if everyone agrees that local planning is better?

> "in defiance of 100+ years of failed attempts"

Just curious, there wasn't any interference from outside during these 'failures' was there? Any trade embargoes? Any military intervention? Any assassinations? Any deliberate destabilizing? Any puppet governments?

> "if you want to see Politburos putting people in gulags again for being counterrevolutionaries"

There's 1.3 - 1.9 million people in American prisons now. 4.9 million who have been in prison. 19 million with felony convictions. Prisons are for-profit, and prisoners are used for forced labour, either paid nothing or paid less than minimum wage. The US ICE is disappearing people off the streets. The US president is targeting people who criticize him accusing them of treason (punishable by death)[1], recently writing """Chuck Schumer said trip was ‘a total dud’, even though he knows it was a spectacular success. Words like that are almost treasonous!""".

Why is "Communism" the cause of gulags but "Capitalism" isn't the cause of mass incarceration, forced labour, and the government covering up how many people die while imprisoned? Why does this American "communism can't work, has never worked, and reminder Communism == mass graves" style comment always feel like a loud pledge of allegiance trying to make it clear to the powers that be that you aren't criticizing them, begging them not to disappear you? Are you not even allowed to entertain a different idea? To consider that even if any given Communism actually can't work and is crappy to live under, that what you're saying is more like a religious recital than something sensible?

[1] https://time.com/7290536/miles-taylor-president-trump-treaso...

> Private property rights are a fundamental tenet of human psychology.

This is a weird religious belief. Property rights are an entirely unnatural construction. Under normal circumstances, you own exactly what you can defend, no more, no less. Property rights are a communal imposition to protect the weak from the strong, and are no more natural than any other socialist endeavor.

For the record, I'm not a communist. I'd probably say my values are pretty close to socialist-capitalist. And that is a form of government that many nations have adopted and are successfully running.

What's been failing is neoliberalism. Every nation that's been moving in that direction has serious problems as their social safety nets have started to collapse.