Our opinions about science depend heavily on whether communism* counts as scientific or once deserved to be so counted. If science’s balance sheet gets to leave off the Soviets, Khmer Rouge, North Korea, Cuba, and Cold-War-Era Eastern Europe then we can have a much more confident and optimistic view of it than if it has to include them.
The case for including it starts with the communism being a naturalist, law-based, large scale empirical theory about the natural phenomena of the human species and its behavior in groups. Marx wasn’t just an economist but a founder – arguably the founder along with Smith – of the scientific economics. The communist desire for uniformity, regularity, organization, planning, industry, large-scale experimentation, impersonal institutions, technological achievement, vast data collection and dislike of idiosyncrasies and behaviors and persons that won’t fit in the system is universal, evident, and makes it apiece with how science acts whenever it sets social policy, even in non-communist states. So science it is.
But the denial of scientific status to communism is as old as the question of what counts as scientific, since Popper originally drew up his falsification criteria with an eye to leaving Marxism off the list of scientific achievements. Read SEP’s concision on the matter:
The Marxist account of history too, Popper held, is not scientific, although it differs in certain crucial respects from psychoanalysis. For Marxism, Popper believed, had been initially scientific, in that Marx had postulated a theory which was genuinely predictive. However, when these predictions were not in fact borne out, the theory was saved from falsification by the addition of ad hoc hypotheses which made it compatible with the facts. By this means, Popper asserted, a theory which was initially genuinely scientific degenerated into pseudo-scientific dogma.
These factors combined to make Popper take falsifiability as his criterion for demarcating science from non-science: if a theory is incompatible with possible empirical observations it is scientific; conversely, a theory which is compatible with all such observations, either because, as in the case of Marxism, it has been modified solely to accommodate such observations, or because, as in the case of psychoanalytic theories, it is consistent with all possible observations, is unscientific.
Sadly, falsificationism is now only mentioned by specialists in the contexts of showing its inadequacies, some of which are apparent even in the SEP’s telling. Falsification requires “no ad hoc additions!” as a backstop, but one man’s ad hoc addition is another man’s proof of the theory’s ability to adapt to new data. To put it in a Latin snob, bumper-stickery way: The Ad Hoc is Post Hoc. After we see the simplicity of Kepler we call epicycles ad hoc, after we have the Big Bang theory we call Einstein’s cosmological constant something he added to the theory ad hoc. Theories need some ability to assimilate findings outside their predictions, since no theory gets as large as communism without explaining a lot of things, and one would be an idiot for throwing out an explanation for a lot of things the minute it was contradicted by just anything, even if it were an empirical fact. Ad hoc is an informal fallacy that is particularly hard to verify, and it is too weak a criteria in itself to refute a theory’s claim to being scientific.
So communism is scientific. This is clearest in its foundational principle: We all seem to agree that science is at least methodologically naturalist, so a scientific account of human society, behavior, and just organisation must be naturalist and deny any value to supernatural causality. Scientific politics thus rests on a critique of eternal law, providence, and the history of salvation, which Marx insisted on more clearly than anyone.
While scientific, communism is also – to put the matter in very non-communist categories – a system designed by the Prince of Lies to maximize human misery in this life and the next, which deserves to be taken into account when we are forming our beliefs about science.
*What I say about communism would for the most part apply to the right wing ideologies of the Twentieth Century too, whose scientific credentials were just as good as the left wing ideology’s.