We know what works and what doesn't work. We have decades of real data from all over the world.
Some aspects of communism work, others do not.
Some aspects of capitalism work, others do not.
Some aspects of fascism work, others do not.
Some aspects of socialism work, other do not.
... and so on
By "work" I mean increasing the standard of living and lifespan of citizens when compared to tribal living. The bar is pretty low, really. I think we should apply what works the best, regardless of the source, but nobody listens to me.
The USA definitely abused the term "communism" into the ground for almost a century; since the creation of the CIA communism has been our enemy number one, and we've spread a lot of misinformation purposefully and with full knowledge.
But, we do know some things for a fact, and should work off of that. For example, standard of living was much higher in Western than Eastern Germany. But... that doesn't mean that Eastern Germany didn't have any benefit to its people. Just less benefit. Why? That's the rub.
Pardon my rambling incoherent thoughts on a comic.