I’ve noticed that things I feel optimistic about tend to turn out to be failures, but when I’m pessimistic about things they turn out great.
So lately I’ve been going into situations assuming the worst, and low and behold things have been coming out better. I interviewed for a job recently, and was really pessimistic about getting it, and I start later this week. I had to help my sister move cross country last month and assumed it’d be a disaster, but it went off almost perfectly.
Turns out the universe is contrarian and will do the opposite of whatever you expect. So if anything us Communists should be MORE Doomer, since it will manifest the revolution happening. It’s reverse Infra-Materialism 
Honestly, I think there’s a lot of poetry surrounding the Cuban revolution.
So, Che was actually in Guatemala during the coup that deposed Arbenz, who was essentially a social democrat who was instituting pretty milquetoast reforms. That didn’t stop the strong arm of imperialism from taking Arbenz off the board though. (I’m not going to go into how this ties into early PR and Edward Bernays because I will prattle on too much.)
This was a radicalising moment for Che.
He took this lesson from Guatemala and he continued on his ideological development. There’s an argument that Guevara pushed Castro to become a Marxist-Leninist but I don’t know enough about that to say for certain, although Che was undoubtedly a very influential figure in the Cuban revolution.
Now, if we skip past the successful Cuban revolution—a Marxist-Leninist armed revolution—to Allende’s presidency in Chile, we have Castro meeting with Allende and not only issuing him a stern warning about the necessity for defending the revolution militarily, you have Castro gifting Allende a gold-plated AK-47 which I doubt was anything less than intentionally symbolic.
Nevertheless, Allende proceeded on his course for a revolutionary reform and despite getting urgent warnings from Cuba and the USSR that General Pinochet was plotting a coup, he ignored the threat.
Ultimately, Pinochet carried out his coup successfully and upon storming the presidential palace, Allende took that very same AK-47 and turned it on himself when all hope was lost.
And we see that the Cuban revolution survives to this day and yet Chile was plunged into decades of the blackest reaction, which successfully eliminated an entire generation of Chilean radicals either by driving them out or by exterminating them.
If Bernie got in and attempted to actually deliver on his promises, the same thing would have happened to him. It would have been the Business Plot 2.0.
I think it’s necessary for all socialists to take the hard-earned lessons from Allende and to avoid letting the next revolutionary moment slip through our fingers. We owe it to his memory.
Edit: Well, what do you know? The Tricontinental Institute just dropped a dossier on the Chilean coup and its implications.