Popper held that Marxism had been initially scientific: Karl Marx postulated a theory which was genuinely predictive.
When these predictions were not in fact borne out, the theory was saved from falsification by adding ad hoc hypotheses to explain away inconvenient facts. By this, a theory which was genuinely scientific became pseudo-scientific dogma.
Popper criticizes theorists like Marx who attempt to accumulate evidence that corroborates their theories and not looking for evidence that would demonstrate that their hypothesis is false.
Popper claimed that falsifiability was an essential feature of any useful scientific theory. If a theory cannot be falsified, neither it nor its predictions can be validated, for everything that happens is by definition consistent with the theory.
As Popper and Kuhn understood it, bold, risky hypotheses are at the heart of great advances in the sciences and scholarship generally.
Utopia, you are standing in it! 
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